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  • General Chemistry  (7.564)
  • GEOPHYSICS  (5.928)
  • INSTRUMENTATION AND PHOTOGRAPHY  (2.550)
  • Analytical Chemistry and Spectroscopy  (2.128)
  • SPACE RADIATION  (1.972)
  • COMMUNICATIONS  (1.377)
  • Cell & Developmental Biology
  • 1970-1974  (19.655)
  • 1910-1914  (2.932)
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  • 1
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    Automated analysis of video data (1974)
    In:  CASI
    Details
    Publikationsdatum: 2006-05-07
    Beschreibung: A software/hardware system designed and developed to perform automated video imagery analysis is described. Major elements included in the analysis system are: (1) sampling oscilloscope; (2) programmable trigger unit; (3) central computer; and (4) software processing library. The function of the scope and trigger unit, in conjunction with the control computer, is to digitize the selected portion of the video image and store as amplitude and time data in computer memory. Evaluation of the video data, analogus to interpretation of a visual image, is accomplished by the processing software. It is indicated that this technique of video image analysis is applicable to a wide variety of nonaerospace applications involving video data and image analysis.
    Schlagwort(e): INSTRUMENTATION AND PHOTOGRAPHY
    Materialart: Chamber of Commerce Proc. of the 1st 1974 Technol. Transfer Conf.; p 181-188
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  • 2
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    Apparatus for calibration of on-board instruments and laboratory modelling of rarefied plasma flows past models (1974)
    In:  CASI
    Details
    Publikationsdatum: 2006-01-11
    Beschreibung: Problems of laboratory simulation of artificial earth satellite flight conditions in the ionosphere are examined, and a setup capable of reproducing the basic parameters of ion flows (with energies of 5-10 eV, energy spectrum width approximately 2x5 eV, and an intensity of 10 to the minus 8th power a/cm/2) past measurement instruments and satellite models is described. Possibilities for further improvement of the apparatus are discussed.
    Schlagwort(e): INSTRUMENTATION AND PHOTOGRAPHY
    Materialart: Interplanet. Medium and Phys. of the Magnetosphere (NASA-TT-F-784); p 282-291
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  • 3
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    Transport of charged particles in the earth's magnetosphere (1974)
    In:  CASI
    Details
    Publikationsdatum: 2006-01-11
    Beschreibung: A review of recent data on and conceptions of processes in which high energy particles are transported across magnetic shells in the earth's magnetosphere is presented. The processes discussed include adiabatic processes (with conservation of all three adiabatic invariants of charged particle motion in the magnetic field), diffusion processes (with violation of only the third or third and second invariants), and the so-called fast nonadiabatic processes, which appear to result from the action of strong electric fields.
    Schlagwort(e): GEOPHYSICS
    Materialart: Interplanet. Medium and Phys. of the Magnetosphere (NASA-TT-F-784); p 247-265
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  • 4
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    Vibrations of the earth's magnetic tail (1974)
    In:  CASI
    Details
    Publikationsdatum: 2006-01-11
    Beschreibung: The natural vibration period of the tail (regarded as bundle of magnetic line-of-force strings) and the characteristic time of recurrence of magnetospheric substorms are of the same order, suggesting the possibility of a relation between these phenomena. A model of the tail in the form of a plasma cylinder whose free boundary is immersed in the interplanetary plasma is examined. The nature of the natural oscillations of the tail excited by variations of the solar wind pressure is studied in this model. These vibrations have a total energy of approximately 10 to the 22nd power erg, which is sufficient to generate magnetospheric substorms.
    Schlagwort(e): GEOPHYSICS
    Materialart: Interplanet. Medium and Phys. of the Magnetosphere (NASA-TT-F-784); p 267-273
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  • 5
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    Calculation of the shape of the boundary of the magnetosphere (1974)
    In:  CASI
    Details
    Publikationsdatum: 2006-01-11
    Beschreibung: The possibilities of calculating the shape and dimensions of the magnetopause are discussed. Initial equations are proposed. A review of existing methods is given.
    Schlagwort(e): GEOPHYSICS
    Materialart: Interplanet. Medium and Phys. of the Magnetosphere (NASA-TT-F-784); p 224-246
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  • 6
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    Analysis of methods of measuring electric-field strength in the magnetosphere (1974)
    In:  CASI
    Details
    Publikationsdatum: 2006-01-11
    Beschreibung: Various methods of electric field strength measurements are examined and evaluated as to accuracy, and the requirements made of instrumentation for satellite measurements of electric field strength in the magnetosphere are indicated.
    Schlagwort(e): GEOPHYSICS
    Materialart: Interplanet. Medium and Phys. of the Magnetosphere (NASA-TT-F-784); p 68-82
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  • 7
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    Hydromagnetic waves guided by the geomagnetic field (1974)
    In:  CASI
    Details
    Publikationsdatum: 2006-01-11
    Beschreibung: Properties of hydromagnetic waves propagating in the magnetosphere from a source of limited dimensions are considered. It is shown that they are closely related to electric currents flowing along geomagnetic lines of force. The notions developed form a theoretical basis for interpretation of fluctuations and polar bays.
    Schlagwort(e): GEOPHYSICS
    Materialart: Interplanet. Medium and Phys. of the Magnetosphere (NASA-TT-F-784); p 34-44
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  • 8
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    East Puna (1974)
    In:  CASI
    Details
    Publikationsdatum: 2006-01-11
    Beschreibung: This field trip mostly involves volcanic features that can be seen from roads in the east Puna District. Most of the features are associated with the eruptions of 1750(?), 1790(?), 1840, 1955, 1960, and the recent flows from Mauna Ulu on the Keauhou Lava Plains during the years 1969 to 1973. Particular emphasis is given to the 1955 and 1960 volcanic activity that occurred near the village of Kapoho.
    Schlagwort(e): GEOPHYSICS
    Materialart: NASA. Ames Res. Center Guidebook to the Hawaiian Planetology Conf.; p 248-257
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  • 9
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    Kaumana lava tube (1974)
    In:  CASI
    Details
    Publikationsdatum: 2006-01-11
    Beschreibung: The entrance to Kaumana Lava Tube is in a picnic ground next to Highway 20 (Kaumana Drive) about 6.5 km southwest of Hilo. The area is passed on the way to the Kona Coast via the Saddle Road and is identified by a Hawaii Visitors Bureau sign. Although it is not the largest lava tube in the islands, Kaumana Lava Tube is an interesting geological formation, displaying many of the features typical of lava tube interiors. It is accessible, relatively easy to walk through, and is in an excellent state of preservation. The tube developed in a historic lava flow (1881, from Mauna Loa), and many aspects of lava tube activity are observed.
    Schlagwort(e): GEOPHYSICS
    Materialart: NASA. Ames Res. Center Guidebook to the Hawaiian Planetology Conf.; p 233-238
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  • 10
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    Mauna Kea (1974)
    In:  CASI
    Details
    Publikationsdatum: 2006-01-11
    Beschreibung: Mauna Kea, the highest of Hawaii's five volcanoes, is the only high landmass in the central Pacific Ocean basin to bear unmistakable signs of Pleistocene glaciation. The stratigraphic record indicates that a summit ice cap formed and disappeared at least four times in the last 250,000 years, and that volcanic eruptions characterized not only the interglacial intervals, but also two of the glacial periods as well. Exposed rock units on the upper slopes of Mauna Kea have been divided into two major groups based on gross lithologic character. The Hamakua Group comprises the bulk of the subaerial shield of the volcano and consists largely of thin-bedded pahoehoe flows of olivine basalt. The overlying Laupahoehoe Group consists of a thin cap of alkalic lavas and pyroclastic layers confined largely to the upper slopes of the mountain. Interstratified with the volcanic units are sedimentary formations that provide evidence of four episodes of ice cap glaciation.
    Schlagwort(e): GEOPHYSICS
    Materialart: NASA. Ames Res. Center Guidebook to the Hawaiian Planetology Conf.; p 239-246
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  • 11
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    Field guide to summit area and upper east rift zone, Kilauea Volcano, Hawaii (1974)
    In:  CASI
    Details
    Publikationsdatum: 2006-01-11
    Beschreibung: The field trip is divided into two sections: (1) Crater Rim Road; and (2) Chain of Craters Road. Most bibliographic references are omitted from the text, but a selected list of references to recent Hawaiian volcanic activity and to special studies is included.
    Schlagwort(e): GEOPHYSICS
    Materialart: NASA. Ames Res. Center Guidebook to the Hawaiian Planetology Conf.; p 200-215
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  • 12
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    Road guide to geological points of interest on the island of Hawaii (1974)
    In:  CASI
    Details
    Publikationsdatum: 2006-01-11
    Beschreibung: This road guide briefly describes the points of geologic interest along the main roads on Hawaii. It begins at Hilo and proceeds around the island in a clockwise direction on State Route 11 to Kailua, then returns to Hilo on State Route 19 to Hilo via Waimea, with side excursions on the other principal roads. Minimum excursion time is two days, allowing only very brief time for the various stops. The return to Hilo from Waimea can be made via Route 19 along the Hamakua Coast (wet, leeward side of island, displaying typical tropical erosion) or via Route 20 over the Humuula Saddle (high, relatively dry and cool; young volcanic features).
    Schlagwort(e): GEOPHYSICS
    Materialart: NASA. Ames Res. Center Guidebook to the Hawaiian Planetology Conf.; p 185-197
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  • 13
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    Aerial reconnaissance over the island of Hawaii (1974)
    In:  CASI
    Details
    Publikationsdatum: 2006-01-11
    Beschreibung: The flight sequence in this guide is nominal and based on optimum weather conditions; it may be altered, depending upon weather and visibility. Also included at the end of the flight sequence for the island of Hawaii are sections for parts of Maui (Haleakala Volcano) and Molokai, which will be flown if Hawaii is completely obscured at flight time.
    Schlagwort(e): GEOPHYSICS
    Materialart: Its Guidebook to the Hawaiian Planetology Conf.; p 113-183
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  • 14
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    Geology of the island of Hawaii (1974)
    In:  CASI
    Details
    Publikationsdatum: 2006-01-11
    Beschreibung: The account of the geology of the individual Hawaiian islands is only a progress report based very largely on the uppermost, visible parts of the Hawaiian volcanic range. The island of Hawaii today consists of five volcanic mountains. All of them are very young, and three of the volcanoes have been active in historic times. At least two other volcanoes which helped to build the island have been buried by more recent ones. Rocks exposed in the cliffs on the northeastern side of Kohala Mountain have been shown by the potassium-argon method to be about 700,000 years old.
    Schlagwort(e): GEOPHYSICS
    Materialart: NASA. Ames Res. Center Guidebook to the Hawaiian Planetology Conf.; p 88-111
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  • 15
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    Recent landforms at Kilaueu Volcano: A selected photographic compliation (1974)
    In:  CASI
    Details
    Publikationsdatum: 2006-01-11
    Beschreibung: Recent eruptive activity at Kilauea has produced great changes in the landscape, modifying old landforms and creating new ones. Some of these landforms are observed fairly commonly in basaltic terrains, but many had rarely, if ever, been observed before in the process of development. The 1969-74 Mauna Ulu eruptions have provided the first historic opportunity at Kilauea to witness and record the development of features associated with flank activity of long duration. The photographs of new or modified landforms in this compilation place special emphasis on possible extraterrestrial analogs.
    Schlagwort(e): GEOPHYSICS
    Materialart: NASA. Ames Res. Center Guidebook to the Hawaiian Planetology Conf.; p 49-86
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  • 16
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    Synopsis of volcanic stratigraphy (1974)
    In:  CASI
    Details
    Publikationsdatum: 2006-01-11
    Beschreibung: Volcanic stratigraphic units are mappable layered units composed of volcanic rocks that are formed on land (subaerially) or under water (subaqueously) by volcanic processes. At least ten different types of volcanic stratigraphic units are recognized. The characteristics for each are discussed briefly and some typical examples are illustrated by diagrams to show their salient features.
    Schlagwort(e): GEOPHYSICS
    Materialart: NASA. Ames Res. Center Guidebook to the Hawaiian Planetology Conf.; p 38-48
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  • 17
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    Origin of the Hawaiian Islands (1974)
    In:  CASI
    Details
    Publikationsdatum: 2006-01-11
    Beschreibung: Recent studies indicate that the Hawaiian volcanic chain is a result of relative motion between the Pacific plate and a melting spot in the earth's mantle.
    Schlagwort(e): GEOPHYSICS
    Materialart: NASA. Ames Res. Center Guidebook to the Hawaiian Planetology Conf.; p 23-36
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  • 18
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    Physiolography of the Hawaiian Islands (1974)
    In:  CASI
    Details
    Publikationsdatum: 2006-01-11
    Beschreibung: Each of the eight principal Hawaiian Islands extending from Kauai on the northwestern end of the chain to Hawaii at the southeastern extremity represents the top of a great basaltic shield volcano that rises 4575 m above the ocean floor. The ages of the islands quite consistently decrease toward the southeast. Kauai is judged to be about 5.3 million years old, whereas Hawaii is less than 750,000 years in age. The ravages of time have had serious effects on the once domelike older volcanoes, so that the traditional shield shape is lost in a fretwork of peaks, ridges, palis, valleys, and plains. Age is not the only determinant of the degree of dissection by running water, waves, and chemical weathering. Another very important factor is the exposure of the particular side of island to excessive rainfall and mercilous trade-wind wave attack. The windward and high lee slopes receive 60 cm or more of rain annually, whereas the lower leeward slopes and coastal areas may receive 4 cm or less annually.
    Schlagwort(e): GEOPHYSICS
    Materialart: NASA. Ames Res. Center Guidebook to the Hawaiian Planetology Conf.; p 20-22
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  • 19
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    A concise history of Hawaii (1974)
    In:  CASI
    Details
    Publikationsdatum: 2006-01-11
    Beschreibung: The review outlines the early migration of Polynesian settlers from the Marquesa and Society Islands, develops the ancient societal hierachy, reports on the historic visits of Captain Cook, and describes the gradual weakening of the native culture and population by increased foreign trade and the final annexation of the islands by the United States of America.
    Schlagwort(e): GEOPHYSICS
    Materialart: Its Guidebook to the Hawaiian Planetology Conf.; p 15-18
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  • 20
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    Introduction (1974)
    In:  CASI
    Details
    Publikationsdatum: 2006-01-11
    Beschreibung: Historical, geographical, and regional geological settings for the conference are presented that include volcanic stratigraphy, a photographic essay describing various landforms observed during eruptive activity at Kilauea Volcano, and a general discussion of the geology of the island of Hawaii. Also included are guides for field trips to interesting geographic features.
    Schlagwort(e): GEOPHYSICS
    Materialart: NASA. Ames Res. Center Guidebook to the Hawaiian Planetology Conf.; p 1-13
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  • 21
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    Radio communications with extra-terrestrial civilizations (1974)
    In:  CASI
    Details
    Publikationsdatum: 2006-01-11
    Beschreibung: Communications between civilizations within our galaxy at the present level of radio engineering is possible, although civilizations must begin to search for each other to achieve this. If an extra-terrestrial civilization possessing a technology at our level wishes to make itself known and will transmit special radio signals to do this, then it can be picked up by us at a distance of several hundreds of light years using already existing radio telescopes and specially built radio receivers. If it wishes, this civilization can also send us information without awaiting our answer.
    Schlagwort(e): COMMUNICATIONS
    Materialart: Inhabited Space, Pt. 2 (NASA-TT-F-820); p 79-82
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  • 22
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    Use of conventional equipment to measure the effective perceived noise level of aircraft (1974)
    In:  CASI
    Details
    Publikationsdatum: 2006-01-11
    Beschreibung: A real time, computerized, measurement method for the effective perceived noise level is reported that uses comparison of two sounds differing in level and frequency to obtain the noise intensity emitted by aircraft and to calculate human psychoacoustic annoyance reactions.
    Schlagwort(e): INSTRUMENTATION AND PHOTOGRAPHY
    Materialart: the 4th Natl. Conf. on Acoustics, Vol. 1A (NASA-TT-F-15375); p 224-232
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  • 23
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    An objective method and measuring equipment for noise control and acoustic diagnostics of motorcars (1974)
    In:  CASI
    Details
    Publikationsdatum: 2006-01-11
    Beschreibung: An objective method and apparatus for noise control and acoustic diagnostics of motorcar engines are reported. The method and apparatus let us know whether the noisiness of the vehicle under test exceeds the admissible threshold levels given by appropriate standards and if so what is the main source of the excessive noise. The method consists in measuring both the overall noise level and the sound pressure levels in definite frequency bands while the engine speed is controlled as well and may be fixed at prescribed values. Whenever the individually adjusted threshold level has been exceeded in any frequency band, a self-sustaining control signal is sent.
    Schlagwort(e): INSTRUMENTATION AND PHOTOGRAPHY
    Materialart: The 4th Natl. Conf. on Acoustics Vol. 1A (NASA-TT-F-15375); p 198-204
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  • 24
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    Charting environmental pollution (1974)
    In:  CASI
    Details
    Publikationsdatum: 2006-01-11
    Beschreibung: It is found that areas affected by different noxious agents are within the limits traced for high noise level areas; consequently, it is suggested that high noise pressure levels should be used as the primary indication of environmental pollution. A complex methodology is reported for charting environmental pollution due to physical, chemical and biological noxious agents on the scale of an industrial district.
    Schlagwort(e): GEOPHYSICS
    Materialart: The 4th Natl. Conf. on Acoustics Vol. 1A (NASA-TT-F-15375); p 192-197
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  • 25
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    Photoelectronic vibrometer with polarized light (1974)
    In:  CASI
    Details
    Publikationsdatum: 2006-01-11
    Beschreibung: A seismic torsiometer is described which is based on the reception by a photosensitive transducer of a light flux modulated by a relative rotation of the optical axes of two polaroids. The torsional vibrations of the polaroid fixed to the shaft are transmitted to the other polaroid (which at the same time is the seismic mass of the apparatus) by means of elastic lamellas. The device can work as accelerometer, vibrometer or frequency meter, depending on the value of the ratio between the proper oscillation frequency of the seismic system and the measured vibration frequency.
    Schlagwort(e): INSTRUMENTATION AND PHOTOGRAPHY
    Materialart: The 4th Natl. Conf. on Acoustics, Vol. 1A (NASA-TT-F-15375); p 68-72
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  • 26
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    Vibration and noise measuring instruments built in the RSR (1974)
    In:  CASI
    Details
    Publikationsdatum: 2006-01-11
    Beschreibung: The demands placed upon vibration and noise measuring instruments are discussed. The instruments that are now being manufactured in the RSR are described, as well as those that are being made ready for manufacture, namely: the VP-3 portable vibrometer, the N2103 precision electronic vibrometer, the N2103 B sonometric preamplifier, as well as vibration transducers of the electrodynamic and piezoelectric types.
    Schlagwort(e): INSTRUMENTATION AND PHOTOGRAPHY
    Materialart: The 4th Natl. Conf. on Acoustics, Vol. 1A (NASA-TT-F-15375); p 62-67
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  • 27
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    Contributions to the problem of piezoelectric accelerometer calibration (1974)
    In:  CASI
    Details
    Publikationsdatum: 2006-01-11
    Beschreibung: After discussing the principal calibration methods for piezoelectric accelerometers, an experimental setup for accelerometer calibration by the reciprocity method is described It is shown how the use of a lock-in voltmeter eliminates errors due to viscous damping and electrical loading.
    Schlagwort(e): INSTRUMENTATION AND PHOTOGRAPHY
    Materialart: The 4th Natl. Conf. on Acoustics, Vol. 1A (NASA-TT-F-15375); p 55-61
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  • 28
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    Intermediate memory devices (1974)
    In:  CASI
    Details
    Publikationsdatum: 2006-01-11
    Beschreibung: Several methods of transfer and processing of data whose practical implementation requires operational memory devices are described. Devices incorporating multistable elements are proposed and their main parameters are given. The possibility of using the proposed devices for storing information for transmission in space radio communications channels is examined.
    Schlagwort(e): COMMUNICATIONS
    Materialart: Space Res. in the Ukraine, No. 3 (NASA-TT-F-15537); p 155-162
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  • 29
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    Instruments for measuring radiant thermal fluxes (1974)
    In:  CASI
    Details
    Publikationsdatum: 2006-01-11
    Beschreibung: An absolute two-sided radiometer, designed on the principle of replacing absorbed radiant energy with electrical energy, is described. The sensitive element of the detector is a thermoelectric transducer of thermal flux. The fabrication technology, methods of measurement, technical characteristics, and general operation of the instrument are presented.
    Schlagwort(e): INSTRUMENTATION AND PHOTOGRAPHY
    Materialart: Space Res. in the Ukraine, No. 3 (NASA-TT-F-15537); p 95-101
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  • 30
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    Possibility of using sources of vacuum ultraviolet irradiation to solve problems of space material science (1974)
    In:  CASI
    Details
    Publikationsdatum: 2006-01-11
    Beschreibung: An urgent problem in space materials science is simulating the interaction of vacuum ultraviolet (VUV) of solar emission with solids in space conditions, that is, producing a light source with a distribution that approximates the distribution of solar energy. Information is presented on the distribution of the energy flux of VUV of solar radiation. Requirements that must be satisfied by the VUV source used for space materials science are formulated, and a critical evaluation is given of the possibilities of using existing sources for space materials science. From this evaluation it was established that none of the sources of VUV satisfies the specific requirements imposed on the simulator of solar radiation. A solution to the problem was found to be in the development of a new type of source based on exciting a supersonic gas jet flowing into vacuum with a sense electron beam. A description of this gas-jet source, along with its spectral and operation characteristics, is presented.
    Schlagwort(e): SPACE RADIATION
    Materialart: Space Res. in the Ukraine, No. 3 (NASA-TT-F-15537); p 102-123
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  • 31
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    Effect of small flares in the neutral component of secondary cosmic radiation (1974)
    In:  CASI
    Details
    Publikationsdatum: 2006-01-11
    Beschreibung: The results are presented of an investigation of the effect of small flares, scale divisions 1 and 1(+), in the neutron component of secondary cosmic radiation from the data of neutron supermonitors at the stations of Kiev, Bukhta Tiksi, and Deep River. It is shown that flares of scale divisions 1 and 1(+) are accompanied by an effect in the neutron component amounting to about 0.4%. A mechanism is presented for calculating the outflow of particles accelerated in small flares, owing to diffusion across the magnetic field of a trap.
    Schlagwort(e): SPACE RADIATION
    Materialart: Space Res. in the Ukraine, No. 3 (NASA-TT-F-15537); p 77-85
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  • 32
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    Analysis of the nature of excessive cosmic radiation in the area of the Brazilian magnetic anomaly at altitudes 250-500km, from Kosmos-225 satellite data (1974)
    In:  CASI
    Details
    Publikationsdatum: 2006-01-11
    Beschreibung: Results are presented from a study of the region of anomalous cosmic radiation in the area of the Brazilian magnetic anomaly at the altitudes 250-500 km, using data measurements taken on the Kosmos-225 satellite (14-29 June 1968). The existence of a stable intensity anomaly discovered in the experiments on the second and third Soviet spacecraft-satellites is confirmed. The total vector of the geomagnetic field at different altitudes was compared with isoline maps. An altitude profile of the South Atlantic anomaly of radiation intensity was obtained, using data from the same instrument. The nature of the anomalies in cosmic radiation intensity over the regions of negative magnetic anomalies is discussed.
    Schlagwort(e): SPACE RADIATION
    Materialart: Space Res. in the Ukraine, No. 3 (NASA-TT-F-15537); p 86-94
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  • 33
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    Acceleration of solar cosmic rays during chromospheric flares (1974)
    In:  CASI
    Details
    Publikationsdatum: 2006-01-11
    Beschreibung: Using the Fokker-Planck equation, an examination is made of the acceleration of charged particles by fluctuational electric fields caused by the propagation of intense radio emission in the long-wave range. Correlation functions of electric fields near the boundary of plasma instability were computed. The interaction of charged particles with these fields is examined. It is shown that due to the interaction of particles with fluctuational fields, solar cosmic rays can be accelerated to energies of E=100 to 1000 MeV.
    Schlagwort(e): SPACE RADIATION
    Materialart: Space Res. in the Ukraine, No. 3 (NASA-TT-F-15537); p 69-76
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  • 34
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    Chromospheric flares and sudden commencements of geomagnetic storms (1974)
    In:  CASI
    Details
    Publikationsdatum: 2006-01-11
    Beschreibung: A catalogue of flare activity was compiled during 1957-1967 (the solar activity cycle). By comparing all reliable SC during this period with chromospheric flares, the following conclusions are drawn; (1) There is no statistically significant correlation between SC and chromospheric flares. (2) The assumption that a shock wave propagates throughout the entire hemisphere is unjustified and contradicts the fact of recurrence of SC. (3) A statistically significant correlation was established between SC and chromospheric flares, that is, a relationship between a SC and the moment that a flare active region transits the Central Meridian. (4) SC are caused by shock waves or tangential discontinuities formed at the western boundary of the quasisteady directed corpuscular flux or at the boundary between sectors.
    Schlagwort(e): SPACE RADIATION
    Materialart: Space Res. in the Ukraine, No. 3 (NASA-TT-F-15537); p 61-68
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  • 35
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    Electromagnetic processes in the atmosphere of pulsars (1974)
    In:  CASI
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    Publikationsdatum: 2006-01-11
    Beschreibung: The work consists of two parts. The first deals with the fine structure of radio pulses. Based on kinetic theory, processes occurring in the plasma shell of a pulsar when external electromagnetic radiation is present are investigated. It is shown that electromagnetic waves cause electrons to drift relative to ions, and initiate longitudinal oscillations. A dispersion equation describing the longitudinal oscillations in magnetized plasma is derived. Conditions for excitation of oscillations are found. Correlation functions of electron density are calculated, along with the coefficients of electromagnetic wave scattering. It is shown that variations in the amplitude of pulsar pulses are associated with scintillations caused by fluctuations in the plasma electron density. The second part of the study presents a mechanism for the radio emission of pulsars. The model of a rotating and a pulsating star, a neutron star with dipolar or more complex magnetic field, is examined.
    Schlagwort(e): COMMUNICATIONS
    Materialart: Space Res. in the Ukraine, No. 3, (NASA-TT-F-15537); p 44-53
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  • 36
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    Classification, scale series and nomenclature of lunar charts (1974)
    In:  CASI
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    Publikationsdatum: 2006-01-11
    Beschreibung: Lunar charts are classified with an eye toward solution of special problems of lunar cartography. The initial state of mapping the moon will require charts with scales of 1:5,000,000; 1:1,000,000; 1:250,000; 1:50,000; and 1:10,000.
    Schlagwort(e): GEOPHYSICS
    Materialart: Current Concepts Regarding the Moon (NASA-TT-F-766); p 139-154
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  • 37
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    The tropospheric calibration model for Mariner Mars 1971 (1974)
    In:  CASI
    Details
    Publikationsdatum: 2006-01-11
    Beschreibung: The effects of the troposphere on arrival time, range, and range rate measurement of radio signals propagating from spacecraft are examined. A tropospheric calibration model which takes into account seasonal variations, various elevations, and apparent location changes was developed. A comparison was made of the effects before and after calibration. Without calibration, a 16-m change in the distance off the spin axis, is induced for a 10-deg minimum elevation symmetrical pass. Even after calibration with the old model, the error in spin axis is still greater than 1 m. Calibration results and estimated uncertainties of the model are given in tabular form. Test results also show that the model met the required accuracy for the Mariner Mars 1971 mission.
    Schlagwort(e): COMMUNICATIONS
    Materialart: Tracking System Analytic Calibration Activities for the Mariner Mars 1971 Mission; p 61-76
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  • 38
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    An evaluation of the ERTS data collection system as a potential operational tool (1974)
    In:  CASI
    Details
    Publikationsdatum: 2006-03-23
    Beschreibung: The Earth Resources Technology Satellite Data Collection System has been shown to be, from the users vantage point, a reliable and simple system for collecting data from U.S. Geological Survey operational field instrumentation. It is technically feasible to expand the ERTS system into an operational polar-orbiting data collection system to gather data from the Geological Survey's Hydrologic Data Network. This could permit more efficient internal management of the Network, and could enable the Geological Survey to make data available to cooperating agencies in near-real time. The Geological Survey is conducting an analysis of the costs and benefits of satellite data-relay systems.
    Schlagwort(e): GEOPHYSICS
    Materialart: NASA. Goddard Space Flight Center 3d ERTS-1 Symp., Vol. 1, Sect. B; p 1099-1111
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  • 39
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    Water-management models in Florida from ERTS-1 data (1974)
    In:  CASI
    Details
    Publikationsdatum: 2006-03-23
    Beschreibung: A prototype multiparameter data acquisition network, installed and operated by the U.S. Geological Survey is a viable approach for obtaining near real-time data needed to solve hydrologic problems confronting nearly 2.5 million residents of south Florida. Selected water quantity and quality data obtained from ground stations are transmitted for relay via ERTS-1 to NASA receiving stations in virtual real time. This data relay system has been very reliable and, by coupling the ground information with ERTS imagery, a modeling technique is available for water resource management in south Florida. An ecological model has been designed for the Shark River Slough in Everglades National Park.
    Schlagwort(e): GEOPHYSICS
    Materialart: NASA. Goddard Space Flight Center 3d ERTS-1 Symp., Vol. 1, Sect. B; p 1071-1088
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  • 40
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    Seasat and polar ice (1974)
    In:  Other Sources
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    Publikationsdatum: 2011-08-16
    Beschreibung: The instrument package for SEASAT-A possesses three tools that could give data greatly needed in ice cap research: the Compressed Pulse Radar Altimeter (CPRA), the Coherent Imaging Radar (CIR), and the Scanning Multifrequency Microwave Radiometer (SMMR). Certain problems that can be studied with each sensor are discussed.
    Schlagwort(e): GEOPHYSICS
    Materialart: NASA, Washington Seasat-A Sci. Contrib.; p 45-46
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  • 41
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    Seasat and floating ice (1974)
    In:  Other Sources
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    Publikationsdatum: 2011-08-16
    Beschreibung: Data collected by SEASAT would be useful in developing predictive physical models for the drift and deformation of sea ice, for estimating the heat budget of the polar seas, for the optimum routing of shipping through pack ice areas, for the design of both offshore structures and shipping capable of surviving in heavy pack ice, and for the tracking of large icebergs and ice islands. The instrument package for SEASAT-A is particularly useful for studying sea ice in that the Coherent Imaging Radar (CIR), the Scanning Multifrequency Microwave Radiometer (SMMR) and the Compressed Pulse Radar Altimeter (CPRA) are not limited by the presence of clouds.
    Schlagwort(e): GEOPHYSICS
    Materialart: NASA, Washington Seasat-A Sci. Contrib.; p 134-135
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  • 42
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    Geodetic corrections and related information from oceanographic measurements made by Seasat-A (1974)
    In:  Other Sources
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    Publikationsdatum: 2011-08-16
    Beschreibung: Oceanographic measurements taken by SEASAT-A are not only applicable to correct altimetry data for the desired geoid but also, as a result, they themselves are useful by-products for basic and applied research in the fields of sciences and engineering, exploratory development in sensor design and measurement techniques, and prediction products for operational fleet support. Among these measurements the important ones are current, sea state, and tides. Identified are parameters of the measurements which will be used to eliminate temporal environmental biases from geodetic measurements, and also to describe the physical processes involved.
    Schlagwort(e): GEOPHYSICS
    Materialart: NASA, Washington Seasat-A Sci. Contrib.; p 47-49
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  • 43
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    VLF emissions and whistlers observed during geomagnetic storms (1974)
    In:  Other Sources
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    Publikationsdatum: 2011-08-16
    Beschreibung: Whistler-triggered emissions and a narrowband hiss are described which were observed over Japan by ISIS 2 during the main phase of the geomagnetic storm of August 9, 1972. The characteristics of the narrowband hiss and increases in the whistler rate during the storm are discussed, and the ISIS-2 data are compared with data on whistler cutoffs and VLF noise breakups obtained by OGO 4 and Alouette I. Since the whistlers and narrowband hiss are usually observed inside and outside the plasmapause, it is thought that the plasmapause may have been located near the low-latitude end of the narrowband hiss during the main phase of the storm. It is suggested that the increases in the whistler rate may have been caused by the formation of whistler ducts in the disturbed plasmapause.
    Schlagwort(e): GEOPHYSICS
    Materialart: Radio Research Laboratories; vol. 21
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  • 44
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    Determination of local values of gas and liquid mass flux in highly loaded two-phase flow (1974)
    In:  Other Sources
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    Publikationsdatum: 2011-08-16
    Beschreibung: A measurement system using a deceleration probe was designed for determining the local values of gas and liquid mass flux in various gas/liquid droplet sprayfields. The system was used to characterize two-phase flowfields generated by gas/liquid rocket-motor injectors. Measurements were made at static pressures up to 500 psia and injected mass flow ratios up to 20. The measurement system can also be used at higher pressures and in gas/solid flowfields.
    Schlagwort(e): INSTRUMENTATION AND PHOTOGRAPHY
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  • 45
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    Indications of fluid immiscibility in glass from West Clearwater Lake impact crater, Quebec, Canada (1974)
    In:  Other Sources
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    Publikationsdatum: 2011-08-16
    Beschreibung: Glass from the West Clearwater Lake hypervelocity impact crater contains numerous spheroids, 10 to 500 microns across, which appear to have formed at high temperatures as fluids immiscible in the enclosing melt. The spheroids are distinguished from small, normal, largely void gas vesicles, which are also present, by being completely filled in all cases; by having fillings which vary in composition from spheroid to spheroid, even between spheroids in close association; and by indications that the present fillings are representative of the contents present before the matrix melt chilled. Most of the spheroids are classified petrographically into three types. The preservation of spheroids in the West Clearwater Lake glass is attributed mainly to the position of the glass masses within the breccias lining the crater floor. It is considered that the glass in this location did not achieve free flight but, as part of a large mass, cooled relatively slowly through the high temperature regime in which the spheroids were generated, and then, when detached, chilled rapidly to preserve a record of this transient stage in their history.
    Schlagwort(e): GEOPHYSICS
    Materialart: Contributions to Mineralogy and Petrology; 46; 1974
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  • 46
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    The neutral atmosphere temperature experiment (1974)
    In:  Other Sources
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    Publikationsdatum: 2011-08-16
    Beschreibung: The AEROS Neutral Atmosphere Temperature Experiment (NATE) is designed to measure the kinetic temperature of molecular nitrogen in the thermosphere. A quadrupole mass spectrometer tuned to N2 measures the N2 density variation in a small spherical antechamber having a knife-edged orifice which is exposed to the atmosphere at the outer surface of the spacecraft. The changing density of N2 due to the spinning motion of the spacecraft permits determination of the velocity distribution of the N2 from which the temperature is calculated. An alternate mode of operation of the instrument allows measurement of the other gases in the atmosphere as well as N2 permitting determination of the neutral particle composition of the atmosphere.
    Schlagwort(e): INSTRUMENTATION AND PHOTOGRAPHY
    Materialart: Zeitschrift fuer Geophysik; 40; 5, 19; 1974
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  • 47
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    Electric field measurements across the Harang discontinuity (1974)
    In:  Other Sources
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    Publikationsdatum: 2011-08-16
    Beschreibung: The Harang discontinuity, the area separating the positive and negative bay regions in the midnight sector of the auroral zone, is a focal point for changes in behavior of many phenomena. Through this region the electric field, in a frame corotating with the earth, rotates through the west from a basically northward field in the positive bay region to a basically southward field in the negative bay region, appearing as a reversal in a single-axis measurement of the north-south component. Thirty-two of these reversals have been identified in the Ogo 6 data from November and December 1969. The discontinuity is dynamic in nature, moving southward and steepening its latitudinal profile as magnetic activity is increased. As activity decreases, it relaxes poleward and spreads out in latitudinal width. It occurs over several hours of magnetic local time.
    Schlagwort(e): GEOPHYSICS
    Materialart: Journal of Geophysical Research; 79; Nov. 1
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  • 48
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    Airborne laser Doppler velocimeter (1974)
    In:  Other Sources
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    Publikationsdatum: 2011-08-16
    Beschreibung: A CO2 laser Doppler detection system has been developed to measure remotely the true airspeed of an aircraft. The system uses a 50-W sealed-off CO2 laser in a homodyne detection system employing a collinear optical telescope, a HgCdTe detector, and a frequency tracking loop. The system was successfully flight-tested on a NASA Convair 990 research aircraft during December 1971 and June 1972. The results indicate that an airspeed measurement under clear weather conditions is feasible up to an altitude of 3000 m with an error of less than 0.5%.-
    Schlagwort(e): INSTRUMENTATION AND PHOTOGRAPHY
    Materialart: Applied Optics; 13; Dec. 197
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  • 49
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    High latitude minor ion enhancements - A clue for studies of magnetosphere-atmosphere coupling (1974)
    In:  Other Sources
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    Publikationsdatum: 2011-08-16
    Beschreibung: An investigation is conducted of upper ionosphere molecular ion composition data, which because of the unexpected, abrupt enhancements sometimes exhibited at high latitudes, may indirectly offer additional clues to understanding the processes by which the lower atmosphere becomes perturbed. It is found that molecular ion irregularities are sometimes localized in a relatively narrow region of time and space. The abruptness of these events suggests that lower atmosphere energetic processes presumed responsible for the ion enhancements may also be narrowly distributed.
    Schlagwort(e): GEOPHYSICS
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  • 50
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    A simulation of the San Andreas fault experiment (1974)
    In:  Other Sources
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    Publikationsdatum: 2011-08-16
    Beschreibung: The San Andreas fault experiment (Safe), which employs two laser tracking systems for measuring the relative motion of two points on opposite sides of the fault, has been simulated for an 8-yr observation period. The two tracking stations are located near San Diego on the western side of the fault and near Quincy on the eastern side; they are roughly 900 km apart. Both will simultaneously track laser reflector equipped satellites as they pass near the stations. Tracking of the Beacon Explorer C spacecraft has been simulated for these two stations during August and September for 8 consecutive years. An error analysis of the recovery of the relative location of Quincy from the data has been made, allowing for model errors in the mass of the earth, the gravity field, solar radiation pressure, atmospheric drag, errors in the position of the San Diego site, and biases and noise in the laser systems. The results of this simulation indicate that the distance of Quincy from San Diego will be determined each year with a precision of about 10 cm. Projected improvements in these model parameters and in the laser systems over the next few years will bring the precision to about 1-2 cm by 1980.
    Schlagwort(e): GEOPHYSICS
    Materialart: Journal of Geophysical Research; 79; Oct. 10
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  • 51
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    Rigidity spectrum of z greater than or equal to 3 cosmic-ray nuclei in the range 4-285 GV and a search for cosmic antimatter (1974)
    In:  Other Sources
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    Publikationsdatum: 2011-08-16
    Beschreibung: A measurement, using the magnetic emulsion spectrometer system, of the differential rigidity spectrum of Z greater than or equal to 3 nuclei of the galactic cosmic radiation is presented. The system was flown on Aug. 22, 1969, from Palestine, Texas. The instrument floated above 125,000 feet for eight hours. The data in the rigidity range 8-285 GV can be represented by a power-law spectrum in rigidity, J(rho) = A rho to the minus gamma power, with the exponent gamma = 2.6 plus or minus 0.10. The spectrum in the range 15-285 GV is also described by the same exponent, gamma = 2.6 plus or minus 0.25. The data below 8 GV cannot be described by the same power law without invoking solar modulation. A set of nonunique parameters for modulation are given. Upper limit for the fraction of antimatter in the rigidity range 4-125 GV is .005 with 95% confidence limit.
    Schlagwort(e): SPACE RADIATION
    Materialart: Astrophysical Journal; 192; Sept. 15
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  • 52
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    SAS-2 observations of gamma rays from the galactic plane (1974)
    In:  Other Sources
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    Publikationsdatum: 2011-08-16
    Beschreibung: Preliminary data are given for the SAS-2 high energy galactic gamma ray observation. These data include both latitude and longitude distributions. The longitude distribution shows a high density region. The latitude distributions toward the center and the anti-center are markedly different, the former showing a two-component structure of half-widths of approximately 3 and 6 deg. The energy spectrum in the range 35 to 200 MeV is hard, consistent with cosmic ray interactions with interstellar matter, including neutral pions decay and emission from energetic electron interactions. The data is consistent with an interpretation in terms of the confinement of the cosmic rays in the spiral arms.
    Schlagwort(e): INSTRUMENTATION AND PHOTOGRAPHY
    Materialart: ESRO The Context and Status of Gamma Ray Astronomy; p 201-204
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  • 53
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    The distribution of cosmic rays in the galaxy and their dynamics as deduced from recent gamma ray observations (1974)
    In:  Other Sources
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    Publikationsdatum: 2011-08-16
    Beschreibung: Data from SAS-2 on the galactic gamma ray line flux as a function of longitude is examined. It is shown that the gamma ray emissivity varies with galactocentric distance and is about an order of magnitude higher than the local value in a toroidal region between 4 and 5 kpc from the galactic center. This enhancement is accounted for in part by first-order Fermi acceleration, compression, and trapping of cosmic rays consistent with present ideas of galactic dynamics and galactic structure theory. Calculations indicate that cosmic rays in the 4 to 5 kpc region are trapped and accelerated over a mean time of the order of a few million years or about 2 to 4 times the assumed trapping time in the solar region of the galaxy on the assumption that only an increased cosmic ray flux is responsible for the observed emission. Cosmic ray nucleons, cosmic ray electrons, and ionized hydrogen gas were found to have a strikingly similar distribution in the galaxy according to both the observational data and the theoretical model discussed.
    Schlagwort(e): SPACE RADIATION
    Materialart: ESRO The Context and Status of Gamma Ray Astronomy; p 241-248
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  • 54
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    Observations of discrete gamma ray sources with SAS-2 (1974)
    In:  Other Sources
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    Publikationsdatum: 2011-08-16
    Beschreibung: Compact gamma ray sources centered on the Crab nebula and the Vela X supernova remnant are considered. An excess in the galactic radiation was observed in both regions. Data indicate that a large fraction of this flux is pulsed. The excess from the Vela region could reflect either a large-scale galactic feature, such as a superposition of spiral arm segments, or it could be associated with the Vela supernova remnant. Low-energy gamma ray bursts were observed in the SAS-2 anticoincidence shielding.
    Schlagwort(e): SPACE RADIATION
    Materialart: ESRO The Context and Status of Gamma Ray Astronomy; p 273-277
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  • 55
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    Optical antenna gain. II - Receiving antennas (1974)
    In:  Other Sources
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    Publikationsdatum: 2011-08-16
    Beschreibung: Expressions are developed for the gain of a centrally obscured, circular optical antenna used as the collecting and focusing optics in a laser receiver, involving losses due to (1) incoming light blockage by central obscuration, (2) energy spillover at the detector, and (3) the effect of local oscillator distribution in the case of heterodyne or homodyne detection. Numerical results are presented for direct detection and for three types of local oscillator distribution (uniform, Gaussian, and matched).
    Schlagwort(e): COMMUNICATIONS
    Materialart: Applied Optics; 13; Oct. 197
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  • 56
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    Cosmic electrons (1974)
    In:  Other Sources
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    Publikationsdatum: 2011-08-16
    Beschreibung: The published literature on cosmic electrons is summarized. The primary and secondary sources of cosmic electrons are discussed, and the propagation of the electrons in the interstellar medium is studied with respect to energy loss mechanisms, age distributions, and spectral modifications during flight. Various portions of the electron and positron spectra are then considered in relation to problems of astrophysics. New information is presented on such topics as the origin of low-energy positrons, the decay kinematics of the pi-mu-e process, the application of age distributions for nuclear cosmic rays to cosmic electrons, and the possibility of nonidentical sources for cosmic electrons and protons.
    Schlagwort(e): SPACE RADIATION
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  • 57
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    Evaluation of a wedge gas-sampling probe (1974)
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    Publikationsdatum: 2011-08-16
    Beschreibung: The performances of a wedge-type gas-sampling probe and pitot probes are compared in applications to flowfield profile studies. The flow structure data obtained by these techniques are found to agree well in flow regions with and without significant gradients. The wedge-type probe showed a good service life and allowed a substantial reduction of the sampling time. The wedge probe design is discussed.
    Schlagwort(e): INSTRUMENTATION AND PHOTOGRAPHY
    Materialart: AIAA Journal; 12; Sept
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  • 58
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    Real-time correction of atmospherically degraded telescope images through image sharpening (1974)
    In:  Other Sources
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    Publikationsdatum: 2011-08-16
    Beschreibung: We present a new technique for the correction of atmospheric distortion in telescope images. Most of this distortion arises from a random phase variation of the incoming light across the telescope aperture. This variation limits the resolving power of even large telescopes to about one arc second. If the sharpness of the images is defined in a suitable way, this sharpness is maximized only when the phase distortion of the incoming light is zero. We present computer simulations of a simple feedback system in which active optical elements, set to maximize the sharpness, correct most of the atmospheric distortion. Photon statistics set the limiting magnitude of the object for which a practical feedback system can work. Details in a sixth magnitude object smaller than 0.1 sec of arc should be resolvable. The system can be conveniently employed within existing telescopes.
    Schlagwort(e): INSTRUMENTATION AND PHOTOGRAPHY
    Materialart: Optical Society of America; vol. 64
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  • 59
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    Solar particles /observations, relationship to the sun acceleration, interplanetary medium/ (1974)
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    Publikationsdatum: 2011-08-16
    Beschreibung: The major features of the propagation of flare particles in the interplanetary medium are discussed in terms of the classic well-behaved flare having unique impulsive injection and a smooth time profile. Topics include flare events, their frequency of occurrence, development of a typical event, energy spectra, proton and electron types, charge and isotopic composition, solar flares and particle accelerations, radio and X-ray observations, the Fermi mechanism, the betatron mechanism, acceleration models, plasma instabilities, two-stage acceleration, propagation mechanisms, the anisotropic stage, the diffusive stage, and the convection and energy loss stage.
    Schlagwort(e): SPACE RADIATION
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  • 60
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    Dicarboxylic acids from electric discharge (1974)
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    Publikationsdatum: 2011-08-16
    Beschreibung: An investigation was conducted concerning the possible synthesis of a suite of dicarboxylic acids similar to that found in the Murchison meteorite. The investigation included the conduction of a chemical evolution experiment which simulated electric discharge through the primitive atmosphere of the earth. The suite of dicarboxylic acids obtained in the electric discharge experiment is similar to that of the Murchison meteorite, except for the fact that 2-chlorosuccinic acid is present in the spark discharge.
    Schlagwort(e): GEOPHYSICS
    Materialart: Nature; 251; Sept. 6
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  • 61
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    ERTS-1 data collection systems used to predict wheat disease severities (1974)
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    Publikationsdatum: 2011-08-16
    Beschreibung: The feasibility of using the data collection system on Earth Technology Satellite-1 to predict wheat leaf rust severity and resulting yield loss was tested. Ground-based data-collection platforms (DCPs), placed in two commercial wheat fields, transmitted to the satellite such meteorological information as maximum and minimum temperature, relative humidity, and hours of free moisture. Meteorological data received from the two DCPs from April 23 to 29 were used to estimate the disease progress curve. Values from the curve were used to predict the percentage decrease in wheat yields resulting from leaf rust. Actual decrease in yield obtained by applying a zinc and maneb spray to control leaf rust, and then comparing yields of the controlled (healthy) and the noncontrolled (rusted) areas. In each field, a 9% decrease in yield was predicted by the DCP-derived data; actual decreases were 12% and 9%.
    Schlagwort(e): GEOPHYSICS
    Materialart: Remote Sensing of Environment; 3; 2, 19; 1974
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  • 62
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    Optical antenna gain. I - Transmitting antennas (1974)
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    Publikationsdatum: 2011-08-16
    Beschreibung: The gain of centrally obscured optical transmitting antennas is analyzed in detail. The calculations, resulting in near- and far-field antenna gain patterns, assume a circular antenna illuminated by a laser operating in the TEM-00 mode. A simple polynomial equation is derived for matching the incident source distribution to a general antenna configuration for maximum on-axis gain. An interpretation of the resultant gain curves allows a number of auxiliary design curves to be drawn that display the losses in antenna gain due to pointing errors and the cone angle of the beam in the far field as a function of antenna aperture size and its central obscuration. The results are presented in a series of graphs that allow the rapid and accurate evaluation of the antenna gain which may then be substituted into the conventional range equation.
    Schlagwort(e): COMMUNICATIONS
    Materialart: Applied Optics; 13; Sept
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  • 63
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    Aplanatic two-mirror telescopes: A systematic study. I - Cassegrainian configuration (1974)
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    Publikationsdatum: 2011-08-16
    Beschreibung: A systematic performance analysis of aplanatic Cassegrainian telescopes has been accomplished by means of a ray trace program. The results indicate that the available field angle for a given geometric spot size is, to a very close approximation, a function of the relative back focal distance only. Image curvatures, as computed by third-order theory and by the ray trace program, were found to be in very close agreement. Image curvature is plotted as a function of the ray height ratio for a wide range of secondary magnification.
    Schlagwort(e): INSTRUMENTATION AND PHOTOGRAPHY
    Materialart: Applied Optics; 13; Sept
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  • 64
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    Image reproduction with interactive graphics (1974)
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    Publikationsdatum: 2011-08-16
    Beschreibung: Software application or development in optical image digital data processing requires a fast, good quality, yet inexpensive hard copy of processed images. To achieve this, a Cambo camera with an f 2.8/150-mm Xenotar lens in a Copal shutter having a Graflok back for 4 x 5 Polaroid type 57 pack-film has been interfaced to an existing Adage, AGT-30/Electro-Mechanical Research, EMR 6050 graphic computer system. Time-lapse photography in conjunction with a log to linear voltage transformation has resulted in an interactive system capable of producing a hard copy in 54 sec. The interactive aspect of the system lies in a Tektronix 4002 graphic computer terminal and its associated hard copy unit.
    Schlagwort(e): INSTRUMENTATION AND PHOTOGRAPHY
    Materialart: Applied Optics; 13; Sept
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  • 65
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    Equatorial ionospheric absorption during half a solar cycle /1964-1970/ (1974)
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    Publikationsdatum: 2011-08-16
    Beschreibung: An extensive series of vertical incidence absorption measurements made at an equatorial station is analyzed in detail to provide information which will lead to a better understanding of the lower ionosphere. A quantitative empirical relationship is derived between absorption and 1-8 A solar flux for moderate levels of solar activity. It is shown that the threshold flux for D-region modification, at a solar zenith angle of 10 deg, is approximately 0.0005 erg per sq cm per sec. Attention is drawn to the incidence of days of high absorption even in the absence of solar X-ray activity. Available evidence points to variability of the order of 10-40 per cent in the intensity of the solar Lyman-alpha radiation as the most likely cause of these unusual, though infrequent, enhancements in absorption.
    Schlagwort(e): GEOPHYSICS
    Materialart: Journal of Atmospheric and Terrestrial Physics; 36; Aug. 197
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  • 66
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    Eleventh-order geopotential resonance on the orbit of Vanguard 3 (1974)
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    Publikationsdatum: 2011-08-16
    Beschreibung: The orbit of Vanguard 3 (1959-7A) is strongly resonant with eleventh-order and odd degree terms in the geopotential. It affords an excellent opportunity to determine a significant linear constraint between these terms. Tracking data on this satellite (in the form of mean Kepler elements) are analyzed over a 3.5-year period in the early 1960s, which ends with the orbit having just passed through perfect commensurability. The eccentricity e and inclination I show the deep resonance variations (up to .0002 in e and 0.02 deg in I) with great clarity. Previous and current geopotential solutions fail to explain these perturbations. A constraint for the deep resonant terms is determined in fully normalized harmonics.
    Schlagwort(e): GEOPHYSICS
    Materialart: Journal of Geophysical Research; 79; Aug. 10
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  • 67
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    A comparison of several computational techniques for solving some common aeronomic problems (1974)
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    Publikationsdatum: 2011-08-16
    Beschreibung: Several numerical integration techniques for solving common aeronomic problems involving species rate equations are compared for speed and accuracy. A newer technique that defines families of species that are nearly conserved is found to be superior to an iterative technique when both methods are applied to simple test problems. The 'conservation' technique is also found to be more economical than the more complex Gear (1969) integration scheme for comparable accuracy.
    Schlagwort(e): GEOPHYSICS
    Materialart: Journal of Geophysical Research; 79; Aug. 1
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  • 68
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    Field-aligned current observations in the polar cusp ionosphere (1974)
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    Publikationsdatum: 2011-08-16
    Beschreibung: Vector magnetic field measurements made during a sounding rocket flight in the polar cusp ionosphere show field fluctuations in the lower F region that are interpreted as being caused by the passage of the payload through a structured field-aligned current system. The field-aligned currents have a characteristic horizontal scale size of about 1 km. Analysis of one large field fluctuation gives a current density of .001 A/sq m.
    Schlagwort(e): GEOPHYSICS
    Materialart: Journal of Geophysical Research; 79; Aug. 1
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  • 69
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    High-latitude day side electric field and particle measurements (1974)
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    Publikationsdatum: 2011-08-16
    Beschreibung: Two rockets carrying electric field and low-energy particle instrumentation were launched near noon at 80 deg magnetic latitude. One flight encountered polar cap conditions only, whereas the other traversed part of the polar cusp. Although weak particle precipitation was measured on both flights, bursts of intense magnetosheath-type electron fluxes were detected on the latter. Strong electric fields such as would result from antisunward convection were observed during both flights. The measurements are compared with results obtained by other types of spacecraft and are interpreted in the light of those data. It is concluded that direct access of magnetosheath electrons is very variable and occurs in small regions within a larger overall region.-
    Schlagwort(e): GEOPHYSICS
    Materialart: Journal of Geophysical Research; 79; Aug. 1
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  • 70
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    Sweet's mechanism in the solar wind (1974)
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    Publikationsdatum: 2011-08-16
    Beschreibung: Sweet (1956, 1958) proposed a mechanism for the rapid, steady-state dissipation of a magnetic field in a resistive plasma. It is shown that Sweet's mechanism operates in the interplanetary medium near 1 AU in structures which Burlaga and Ness (1968) have identified and called D-sheets. The basic equations are considered of a specific mathematical model provided by Parker (1963) for the case of antiparallel fields and incompressible flow. The theoretical conclusions are related to interplanetary observations.
    Schlagwort(e): SPACE RADIATION
    Materialart: Astrophysical Journal; 191; Aug. 1
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  • 71
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    An unusual photograph of an air lightning discharge (1974)
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    Publikationsdatum: 2011-08-16
    Schlagwort(e): GEOPHYSICS
    Materialart: Weather; 29; Jan. 197
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  • 72
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    Stellar interferometer for figure sensing of orbiting astronomical telescopes (1974)
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    Publikationsdatum: 2011-08-16
    Beschreibung: An interferometric device designed to be located in the focal plane of a large astronomical telescope is presented. The prime application is for the forthcoming large space telescope. The device is to perform interferometry on the optical wavefront arising from a single star after it has propagated through the telescope. The concept of a focal plane figure sensor has been experimentally verified by fabricating and testing an operating laboratory breadboard figure sensor. A set of linear independent control equations are derived that define the operations for utilizing a focal plane figure sensor in the control loops for the positioning of the secondary mirror and for the active control of the primary mirror optical figure. A number of scientific experiments that could be performed with the interferometer are also briefly discussed.
    Schlagwort(e): INSTRUMENTATION AND PHOTOGRAPHY
    Materialart: Applied Optics; 13; Aug. 197
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  • 73
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    The subsequence weight distribution of summed maximum length digital sequences (1974)
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    Publikationsdatum: 2011-08-16
    Beschreibung: An attempt is made to develop mathematical formulas to provide the basis for the design of pseudorandom signals intended for applications requiring accurate knowledge of the statistics of the signals. The analysis approach involves calculating the first five central moments of the weight distribution of subsequences of hybrid-sum sequences. The hybrid-sum sequence is formed from the modulo-two sum of k maximum length sequences and is an extension of the sum sequences formed from two maximum length sequences that Gilson (1966) evaluated. The weight distribution of the subsequences serves as an approximation to the filtering process. The basic reason for the analysis of hybrid-sum sequences is to establish a large group of sequences with good statistical properties. It is shown that this can be accomplished much more efficiently using the hybrid-sum approach rather than forming the group strictly from maximum length sequences.
    Schlagwort(e): COMMUNICATIONS
    Materialart: IEEE Transactions on Communications; COM-22; Aug. 197
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  • 74
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    H2SO4-HNO3-H2O ternary system in the stratosphere (1974)
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    Publikationsdatum: 2011-08-16
    Beschreibung: Estimation of the equilibrium vapor pressure over the ternary system H2SO4-HNO3-H2O to study the possibility of stratospheric aerosol formation involving HNO3. It is shown that the vapor pressures for the ternary system H2SO4-HNO3-H2O with weight composition around 70-80% H2SO4, 10-20% HNO3, 10-20% H2O at -50 C are below the order of 10 to the minus 8th mm Hg. It is concluded that there exists more than sufficient nitric acid and water vapor in the stratosphere to participate in ternary system aerosol formation at -50 C. Therefore, HNO3 should be present in stratospheric aerosols, provided that H2SO4 is also present.
    Schlagwort(e): GEOPHYSICS
    Materialart: Nature; 250; Aug. 2
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  • 75
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    Raman scattering applied to hypersonic air flow (1974)
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    Publikationsdatum: 2011-08-16
    Beschreibung: The Raman scattering technique was applied to measure the local static temperature and gas number density over a sharp-edge flat-plate model in a Mach 5 nozzle of the Langley nozzle test chamber with air as the test gas. The angle of attack varied from -5 to 15 deg, and the stagnation temperature varied from 317 to 442 K, with stagnation pressures ranging from 170 kN to 2.8 MN/sq m. The measured values of static temperature and density ranged from 60 to 100 K and from 0.03 to 0.8 kg/cu m, respectively. A comparison with calculated values based on static pressure measurements along the model shows that the Raman scattering technique is a viable measurement method in applications to high-speed three-dimensional flows.
    Schlagwort(e): INSTRUMENTATION AND PHOTOGRAPHY
    Materialart: AIAA Journal; 12; Aug. 197
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  • 76
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    The distribution of cosmic rays in the Galaxy and their dynamics as deduced from recent gamma-ray observations (1974)
    In:  Other Sources
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    Publikationsdatum: 2011-08-16
    Beschreibung: Recent data from SAS-2 on the galactic gamma-ray line flux as a function of longitude reveal a broad maximum in the gamma-ray intensity in the longitude region less than or equal to 30 deg. These data, when unfolded, imply that the low-energy (1 to 10 GeV) galactic cosmic-ray flux varies with galactocentric distance and is about an order of magnitude higher than the local value in a toroidal region between 4 and 5 kpc from the galactic center. It is further shown that this enhancement can be plausibly accounted for by first-order Fermi acceleration, compression, and trapping of cosmic rays consistent with present ideas of galactic dynamics and galactic structure theory. Calculations indicate that cosmic rays in the 4- to 5-kpc region are trapped and accelerated over a mean time of the order of a few million years or about 2 to 4 times the assumed trapping time in the solar region of the Galaxy.
    Schlagwort(e): SPACE RADIATION
    Materialart: Astrophysical Journal; 191; July 15
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  • 77
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    Origin of QSO absorption lines (1974)
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    Publikationsdatum: 2011-08-16
    Beschreibung: Consideration of the origin of the absorption lines in QSOs with observed absolute redshifts much less than the empirical values. As a possible alternative to the plasmoid mechanism for decreasing the relatively large possible macroscopic or bulk motions in QSO clouds, it is shown that certain large relative bulk motions in QSO clouds can be dissipated without the presence of strong magnetic fields and without large adiabatic expansions. The essence of the argument is that a cloud with convergent internal velocities can coalesce inelastically, because the internal kinetic energy can be dissipated and radiated away. There are thus indications that observed QSO absorption clouds may have their origin in clouds with internal velocities which are convergent.
    Schlagwort(e): SPACE RADIATION
    Materialart: Nature; 250; July 26
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  • 78
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    478-keV and 431-keV line emissions from alpha-alpha reactions (1974)
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    Publikationsdatum: 2011-08-16
    Schlagwort(e): SPACE RADIATION
    Materialart: Astrophysical Journal; 191; July 1
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  • 79
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    Bremsstrahlung in the atmosphere at satellite altitudes (1974)
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    Publikationsdatum: 2011-08-16
    Beschreibung: Transport calculations have been made to determine the emission of bremsstrahlung by electrons in the atmosphere and the penetration of this radiation to high altitudes where it can be detected by satellite-borne instruments. The calculations were done assuming uniform wide-area precipitation into the atmosphere of an electron flux isotropic over the downward hemisphere. The intensity and energy spectrum of the bremsstrahlung have been obtained for the case of incident monoenergetic electron beams at energies between 20 keV and 2 MeV, for incident electron beams with exponential spectra with e-folding energies between 5 and 200 keV.
    Schlagwort(e): GEOPHYSICS
    Materialart: Journal of Atmospheric and Terrestrial Physics; 36; July 197
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  • 80
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    A representation of Jacchia's thermospheric models in spherical harmonic functions (1974)
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    Publikationsdatum: 2011-08-16
    Beschreibung: The Jacchia models are represented in terms of spherical harmonic functions. This representation has the advantage of ease of comparison with other global theoretical and empirical models that use this mathematical form. Furthermore, it is analytic, continuous, and has continuous derivatives all over the globe. The representation of the exospheric temperatures shows clearly the amplitudes of the various periodic terms and uses relatively few constants. An example of a similar representation for the total mass density at a particular height and level of solar activity is given as well.
    Schlagwort(e): GEOPHYSICS
    Materialart: Planetary and Space Science; 22; June 197
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  • 81
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    1.0 arc second structure on the sun at 3.71 cm wavelength (1974)
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    Publikationsdatum: 2011-08-16
    Schlagwort(e): SPACE RADIATION
    Materialart: Solar Physics; 36; June 197
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    Ionization equilibrium in soft X-ray-emitting solar flares (1974)
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    Publikationsdatum: 2011-08-16
    Beschreibung: Studies of the 1.9-A line produced by highly ionized iron during a solar flare indicate that this emission occurs under conditions approaching a steady-state ionization equilibrium. Time-dependent and steady-state ionization equilibrium values are used for calculation of 1.9 A line fluxes per unit flare emission. The results are compared with those obtained by observations of some four solar flares, showing that the calculations from time-dependent equilibrium values approximate the observed line flux values with the same accuracy as the calculations from steady-state equilibrium values only when the electron densities are equal to or greater than 10 billion per cu cm.
    Schlagwort(e): SPACE RADIATION
    Materialart: Solar Physics; 36; June 197
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  • 83
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    Solar longitude dependence of some characteristics of type III radio bursts from metric to hectometric wavelengths (1974)
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    Publikationsdatum: 2011-08-16
    Beschreibung: Using the observed data for metric and hectometric type III radio bursts, the dependence of burst characteristics on the solar longitude has been examined over a wide frequency range. It is found that there exists and east-west asymmetry for the extension of metric type III bursts into the hectometric wavelength range. In particular, hectometric bursts are rarely observed for solar flares associated with metric bursts east of 60 E solar longitude. Furthermore, for east longitudes, the low-frequency radio observations show a large dispersion in drift time interval.
    Schlagwort(e): SPACE RADIATION
    Materialart: Solar Physics; 36; May 1974
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    On helium-like 1s2l-1snl prime transitions in solar flare spectra (1974)
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    Publikationsdatum: 2011-08-16
    Beschreibung: Expected wavelengths and intensities are computed for 1s2l-1snl prime transitions in helium-like ions of the abundant elements from oxygen to iron under coronal conditions. Probable observations of some of these lines in the spectra of solar flares are discussed, and attention is called to a possible reversal of singlet and triplet intensities as compared to laboratory observations.
    Schlagwort(e): SPACE RADIATION
    Materialart: Solar Physics; 36; May 1974
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    Estimation of stratospheric-mesospheric density fields from satellite radiance data (1974)
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    Publikationsdatum: 2011-08-16
    Beschreibung: Description of a method for deriving horizontal density fields at altitudes above 30 km directly from satellite radiation measurements. The method is applicable to radiation measurements from any instrument with suitable transmittance weighting functions. Data such as those acquired by the Satellite Infrared Spectrometers on satellites Nimbus 3 and 4 are employed for demonstrating the use of the method for estimating stratospheric-mesospheric density fields.
    Schlagwort(e): GEOPHYSICS
    Materialart: Monthly Weather Review; 102; Apr. 197
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  • 86
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    Hot spot and trench volcano separations (1974)
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    Publikationsdatum: 2011-08-16
    Beschreibung: It is suggested that the distribution of separations between trench volcanos located along subduction zones reflects the depth of partial melting, and that the separation distribution for hot spot volcanoes near spreading centers provides a measure of the depth of mantle convection cells. It is further proposed that the lateral dimensions of mantle convection cells are also represented by the hot-spot separations (rather than by ridge-trench distances) and that a break in the distribution of hot spot separations at 3000 km is evidence for both whole mantle convection and a deep thermal plume origin of hot spots.
    Schlagwort(e): GEOPHYSICS
    Materialart: Nature; 249; June 28
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    NO and O3 measurements in the lower stratosphere from a U-2 aircraft (1974)
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    Publikationsdatum: 2011-08-16
    Beschreibung: In situ measurements of nitric oxide and ozone were carried out at altitudes up to 21 km during two flights of a U-2 aircraft on Dec. 6 and 18, 1973, over the west coast of the United States. A chemiluminescent detector based on the luminescent reaction of nitric acid with excess ozone was used in nitric acid measurements. Ozone concentration measurements were based on the absorption of the Hg line at 2,537 A in the Hartley continuum. The results are compared with available data.
    Schlagwort(e): GEOPHYSICS
    Materialart: Nature; 249; June 28
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    The response of a propeller anemometer to turbulent flow with the mean wind vector perpendicular to the axis of rotation (1974)
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    Publikationsdatum: 2011-08-16
    Beschreibung: Determination of the properties of the system transfer function of the vertical-velocity propeller anemometer. A treatment of this problem is presented which is based on an analysis of estimates of the system transfer function derived from estimates of spectra calculated from time histories of indicated vertical velocity and on estimates of the associated input Eulerian vertical-velocity frequency spectra based on the hypothesis that instrument degradation of the Fourier components occurs in the inertial subrange.
    Schlagwort(e): INSTRUMENTATION AND PHOTOGRAPHY
    Materialart: Boundary-Layer Meteorology; 6; May-June
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    The Fokker-Planck coefficient for pitch-angle scattering of cosmic rays (1974)
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    Publikationsdatum: 2011-08-16
    Beschreibung: For the case of homogeneous, isotropic magnetic field fluctuations, it is shown that most theories which are based on the quasi-linear and adiabatic approximations yield the same integral for the Fokker-Planck coefficient for the pitch-angle scattering of cosmic rays. For example, despite apparent differences, the theories due to Jokipii and to Klimas and Sandri yield the same integral. It is also shown, however, that this integral in most cases has been evaluated incorrectly in the past. For small pitch angles, the errors in previous evaluations are fortuitously of minor importance. For large pitch angles, however, these errors become more significant; and for pitch angles of 90 deg, the actual Fokker-Planck coefficient contains a delta function which has been overlooked in the past. The implications of these corrections on the possibility of relating cosmic-ray diffusion coefficients to observed properties of the interplanetary magnetic field are discussed.
    Schlagwort(e): SPACE RADIATION
    Materialart: Astrophysical Journal; 190; June 1
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    Astronomical demonstration of an infrared upconverter (1974)
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    Publikationsdatum: 2011-08-16
    Beschreibung: An upconverter has been used to convert infrared photons from astronomical sources to higher frequency quanta that were detected with a pulse-counting photomultiplier photometer. It is pointed out that these observations represent the first successful astronomical demonstration of infrared upconversion. Upconversion is carried out in an optically nonlinear medium, which in the upconverter described is a lithium iodate crystal. A 0.6943-micrometer high peak power ruby laser pump was developed for the demonstration.
    Schlagwort(e): INSTRUMENTATION AND PHOTOGRAPHY
    Materialart: Nature; 249; June 14
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    New dimensions in satellite hydrology (1974)
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    Publikationsdatum: 2011-08-16
    Beschreibung: Consideration of the use of remote sensing technology applied from satellites to obtain information for the rapid and continuing assessment of the hydrologic cycle. A detailed account is given of the hydrological information made available through the activities of the ERTS-1 satellite, an experimental satellite entirely devoted to earth resources observations, and the NOAA-2 satellite, a high-resolution operational environmental satellite. Following a description of the satellites and their payloads, it is shown how with their aid information can be obtained regarding atmospheric moisture, surface water and snow cover, glaciers, potential flood situations, and subsurface water fluctuations. In addition, the use of the ERTS-1 and NOAA-2 satellites in watershed characterization and modeling and in monitoring water quality is discussed.
    Schlagwort(e): GEOPHYSICS
    Materialart: vol. 55; July 197
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  • 92
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    On the age of the Onverwacht Group, Swaziland sequence, South Africa (1974)
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    Publikationsdatum: 2011-08-16
    Beschreibung: Some rocks of the Onverwacht Group, South Africa, have been analyzed for Rb and Sr concentrations and Sr isotopic composition. These rocks include volcanic rocks, layered ultramafic differentiates and cherty sediments. Whole rock data indicate that the Rb-Sr isotopic systems in many samples were open and yield no reasonable isochron relationships. However, the data of mineral separates from a basaltic komatiite define a good isochron of 3.50 (plus or minus .2) b.y. with an initial Sr-87/Sr-86 ratio of 0.70048 plus or minus 5. The orthodox interpretation of this age is the time of the low grade metamorphism. It is reasonable to assume that the age of 3.50 b.y. might also represent the time of initial Onverwacht volcanism and deposition. The initial Sr-87/Sr-86 ratio obtained above is important to an understanding of the Sr isotopic composition of the Archean upper mantle.
    Schlagwort(e): GEOPHYSICS
    Materialart: Geochimica et Cosmochimica Acta; 38; June 197
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    Empirical solar proton model for orbiting spacecraft applications (1974)
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    Publikationsdatum: 2011-08-16
    Beschreibung: An empirical model for energetic solar proton fluxes is presented. With this model the effects of such protons on geocentric space missions, to be flown during the next solar active period (1977-1983), and with orbits involving partial magnetospheric shielding, may be estimated. A synoptic background review is given, followed by a detailed discussion of the model's use, errors, uncertainties, and limitations, including sample calculations which demonstrate the application of specific or general project missions. Finally, for circular trajectories, percentage exposure maps are presented, depicting fractional mission times spent outside particular L shells as functions of orbit altitude and inclination.
    Schlagwort(e): SPACE RADIATION
    Materialart: IEEE Transactions on Aerospace and Electronic Systems; AES-10; July 197
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    An autoranging scanning system and compatible methods of noise reduction (1974)
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    Publikationsdatum: 2011-08-16
    Beschreibung: The autoranging scanning system discussed combines in a unique way four different methods for removing noise. The system employs a narrow-band amplifier. Other noise reduction methods make use of digital summation, convolution numbers, and the coaddition of scans. The system was designed to digitize the output of an infrared spectrometer and to record it on magnetic tape. Light passes through a mechanical light chopper and the spectrometer optics, and falls on the PbS cell to produce a signal which is amplified by the first preamplifier.
    Schlagwort(e): INSTRUMENTATION AND PHOTOGRAPHY
    Materialart: Review of Scientific Instruments; 45; July 197
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    Mathematical operations by optical processing (1974)
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    Publikationsdatum: 2011-08-16
    Beschreibung: Some recent developments in coherent optical processing are described in this paper. Specifically, the use of one or more elementary gratings to perform useful processing operations and computer-generated spatial filters to obtain generalized transforms are discussed. Applications incorporating nonlinear optical elements and optical feedback into the processing system are also presented.
    Schlagwort(e): INSTRUMENTATION AND PHOTOGRAPHY
    Materialart: Optical Engineering; 13; May-June
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    Solar proton fluences for 1977-1983 space missions (1974)
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    Publikationsdatum: 2011-08-16
    Beschreibung: The probability with which any given solar proton fluence level will be exceeded during a space mission is computed for mission to be flown during the active phase of the next solar cycle (1977-1983). This probability is a function of fluence level, proton energy threshold, and mission duration. Calculations are based on 1966-1972 data only. In estimating mission fluences, a distinction is made between ordinary and anomalously large events. Probable numbers of each type of event are estimated from Burrell's extension of Poisson statistics. Fluences of all anomalously large events are assumed to have a spectrum given by the August 1972 event, while fluences of the ordinary events are assumed to obey a log normal distribution.
    Schlagwort(e): SPACE RADIATION
    Materialart: Journal of Spacecraft and Rockets; 11; June 197
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    The anomalous abundance of cosmic-ray nitrogen and oxygen nuclei at low energies (1974)
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    Publikationsdatum: 2011-08-16
    Beschreibung: Recent measurements using the Goddard-University of New Hampshire cosmic-ray telescope on the Pioneer 10 spacecraft have revealed an anomalous spectrum of nitrogen and oxygen nuclei relative to other nuclei such as He and C, in the energy range 3-30 MeV per nucleon. The intensity of nitrogen and oxygen nuclei is enhanced by a factor of up to 20 relative to their abundance in galactic or solar cosmic rays. It is argued that this is most likely a new extrasolar component of cosmic rays.
    Schlagwort(e): SPACE RADIATION
    Materialart: Astrophysical Journal; 187; Feb. 1
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  • 98
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    Seasonal canopy reflectance patterns of wheat, sorghum, and soybean (1974)
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    Publikationsdatum: 2011-08-16
    Beschreibung: An investigation was conducted of canopy-reflectance patterns as a basis for the determination of surface conditions. Two fields each of wheat, sorghum, and soybeans were selected in a bottom land area. One field contained a dark-colored, silty clay loam and the other a light-colored, silt loam. The study suggests that the reflectance ratio of the 545- to 655-nm-wavelengths may be used as an indicator of crop growth.
    Schlagwort(e): GEOPHYSICS
    Materialart: Remote Sensing of Environment; 3; 1, 19; 1974
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    Equatorial composition in the 137- to 225-km region from the San Marco 3 mass spectrometer (1974)
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    Publikationsdatum: 2011-08-16
    Beschreibung: The neutral atmospheric composition experiment (Nace) carried by the San Marco 3 (SM 3) satellite measured the equatorial atmospheric composition during the reentry period of Nov. 21-28, 1971. The mass density and molecular nitrogen density measured by the Nace are in agreement with values measured by rocket experiments and inferred from satellite experiments. The average total oxygen content measured by Nace is 30% below the value suggested by von Zahn at 150-km altitude. When it is assumed that his value for the molecular oxygen density at 150 km represents averaged rocket results applicable to the equatorial thermosphere, the Nace total oxygen content results in an atomic oxygen concentration comparable to the mean value of Cira (1965). The Nace helium measurements interpreted in terms of an altitude profile have an altitude distribution similar to that of molecular nitrogen below 165 km.
    Schlagwort(e): GEOPHYSICS
    Materialart: Journal of Geophysical Research; 79; May 1
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    Computer simulation of the Pioneer 10 microwave occultation experiment (1974)
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    Publikationsdatum: 2011-08-16
    Beschreibung: As Pioneer 10 approaches the planet Jupiter, its trajectory will carry it behind the planet, as seen from the earth. The microwave telemetry signal from the spacecraft will then pass through the Jovian atmosphere on its way to the earth, and analysis of the effects of the atmosphere on the signal should yield information on the atmospheric structure. To help define the capabilities of this experiment and to aid the analysis of the real data, we have simulated the occultation experiment on a computer by using model Jovian atmospheres and a predicted trajectory. The results indicate that the useful depth of penetration of the microwave signal will be governed by ammonia absorption rather than superrefractivity. The experiment is apparently far more sensitive to variations in cloud-top temperature than to variations in the hydrogen-helium ratio. Characteristic 'flashes' in the attenuation record of the signal may yield information on the location of the top of the Jovian convective zone.
    Schlagwort(e): COMMUNICATIONS
    Materialart: Journal of Geophysical Research; 79; May 1
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