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  • GEOPHYSICS  (351)
  • INSTRUMENTATION AND PHOTOGRAPHY  (236)
  • LUNAR AND PLANETARY EXPLORATION  (207)
  • Physics  (177)
  • Chemical Engineering  (174)
  • COMMUNICATIONS  (112)
  • ASTROPHYSICS
  • 1975-1979  (534)
  • 1970-1974  (820)
  • 1979  (534)
  • 1972  (473)
  • 1971  (347)
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  • 1975-1979  (534)
  • 1970-1974  (820)
Year
  • 1
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    The diameter of Pallas from its occultation of SAO 85009 (1979)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: The May 29, 1978, occultation of SAO 85009 by Pallas was observed photoelectrically at seven widely spaced sites. The observations are well represented by an elliptical apparent limb profile having semimajor and semiminor axes of 279.5 + or - 2.9 and 262.7 + or - 4.5 km, respectively. Combining these results with published information on the light curve and rotational pole position, Pallas's mean diameter is found to be 538 + or - 12 km, which yields a mean density for Pallas of 2.8 + or - 0.5 g/cu cm and a visual geometric albedo of 0.103 + or - 0.005. The diameter of Pallas as determined from this occultation is significantly smaller than the values derived by radiometric, polarimetric, and double-image techniques.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Astronomical Journal; 84; Feb. 197
    Format: text
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  • 2
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    Atmospheric density variations at 140 kilometers deduced from precise satellite radar tracking data. (1972)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: Discussion of the technique of evaluating density values from precise radar-tracking data of satellites in the altitude region from 130 to 140 km. Inclinations of these satellites were between 106 and 112 deg. A detailed examination of all elements of the density-reduction techniques was conducted, and consideration was given to recent advances in geodesy, drag-coefficient modeling, and orbit-determination techniques. Ten days of high-resolution density data deduced from orbital decay of each of three satellites are presented. Three types of density variations at 140 km are discernible in these data: periodic daily density variations with a density amplitude of about 10%; density increases of up to 35% associated with enhanced geomagnetic activity during which the planetary geomagnetic index Kp reached a value of 8 units; and an observed semiannual variation of about 20%, which indicates a total semiannual variation of 35 to 40%.
    Keywords: GEOPHYSICS
    Type: Journal of Geophysical Research; 77; Apr. 1
    Format: text
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  • 3
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    Atmospheric implications of studies of Central American volcanic eruption clouds (1979)
    In:  Other Sources
    Details
    Publication Date: 2011-08-17
    Keywords: GEOPHYSICS
    Type: Journal of Geophysical Research; 84; Nov. 20
    Format: text
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  • 4
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    Evidence for lightning on Venus (1979)
    In:  Other Sources
    Details
    Publication Date: 2011-08-17
    Description: Evidence for lightning on Venus obtained by the Pioneer Venus 1 Orbiter is presented. The first indications of lightning were detected by the electric field detector on board the Orbiter when the spacecraft periapsis, which is well within the ionosphere, moved into the night side of the planet. Impulsive wave signals were primarily detected at altitudes less than 25 km, and were found to be strongest at frequencies corresponding to propagation in the whistler mode, occurring at an average rate of about 0.5/sec. The signals were often observed during intervals of low and variable electron densities. It is tentatively concluded on the basis of the above observations that the impulsive events were caused by Venusian lightning.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Nature; 279; June 14
    Format: text
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  • 5
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    Stellar model chromospheres. XI - A survey of Ca II lambda 8542 line profiles in late-type stars of differing chromospheric activity (1979)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Keywords: ASTROPHYSICS
    Type: PB80-144215 , Astrophysical Journal Supplement Series; 41; Nov. 197
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  • 6
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    Absorption of whistler mode waves in the ionosphere of Venus (1979)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: It is shown that whistler mode waves from the ionosheath of Venus are absorbed by Landau damping at the dayside ionosphere boundary. This process heats the ionospheric electrons and it may provide an important energy input into the dayside ionosphere. Cyclotron damping of the waves does not occur in the same region. However, Landau damping of ionosheath waves is apparently not an important energy source in the nightside ionosphere. Impulsive events in the nightside ionosphere seem to fall into two classes: (1) lightning signals (near periapsis) and (2) noise, which may be caused by gradient or current instabilities.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Science; 205; July 6
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  • 7
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    Field-aligned particle currents near an auroral arc. (1971)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: A Nike-Tomahawk rocket equipped to measure electric and magnetic fields and charged particles from a few eV to several hundred keV energy was flown into an auroral band on April 11, 1970. The purpose of this flight was to obtain evidence of the low-energy electrons and protons that constitute a field-aligned sheet current, and also to obtain the magnetic signature of such a current and the electric field in and near the auroral-arc electric current system. Particular attention was given to a sudden increase in the field-aligned current associated with a prior sudden increase in the electric field and a sudden change in the magnetic field, all occurring near the edge of a visual auroral arc. Data obtained are discussed and analyzed; they present an important contribution to the problem of mapping of atmospheric auroral phenomena to the magnetospheric equatorial plane.
    Keywords: GEOPHYSICS
    Type: Journal of Geophysical Research; 76; Dec. 1
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  • 8
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    A rocket-borne data-manipulation experiment using a microprocessor (1979)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: The development of a data-manipulation experiment using a Z-80 microprocessor is described. The instrumentation is included in the payloads of two Nike Apache sounding rockets used in an investigation of energetic particle fluxes. The data from an array of solid-state detectors and an electrostatic analyzer is processed to give the energy spectrum as a function of pitch angle. The experiment performed well in its first flight test: Nike Apache 14.543 was launched from Wallops Island at 2315 EST on 19 June 1978. The system was designed to be easily adaptable to other data-manipulation requirements and some suggestions for further development are included.
    Keywords: GEOPHYSICS
    Type: NASA-CR-158647 , UILU-ENG-79-2503 , AERONOMY-84 , (ISSN 0568-0581)
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  • 9
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    Atmospheric density variations at 140 km deduced from precise satellite radar track ing data (1971)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Atmospheric density variations at 140 km deduced from precise satellite radar tracking data
    Keywords: GEOPHYSICS
    Type: NASA-TM-X-64610
    Format: application/pdf
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  • 10
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    Reference data for thermocouple materials below the ice point. (1972)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Standard thermoelectric data have been determined for four thermocouple combinations used below the ice point: commercial types E, K, and T and the special combination of KP vs Au-0.07 at.% Fe. Power series coefficients necessary to generate E = f(T) data for these combinations are given. In addition, extensive tests were carried out to ascertain the variability between materials from different manufacturers. Typical wires processed for low-temperature usage often have slightly thermoelectric properties (up to 1%) from those, nominally identical, wires made for high-temperature applications. Generally, type E is the most satisfactory standardized commercial combination. The Au-0.07 at.% Fe material has been examined in particular detail, because it is not yet an ISA standard material. It has excellent sensitivity in the liquid helium/liquid hydrogen temperature range and a nearly linear thermovoltage at higher temperatures.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: Symposium on Temperature; Jun 21, 1971 - Jun 24, 1971; Washington, DC
    Format: text
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