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  • ASTRONOMY  (47)
  • Animals
  • Life and Medical Sciences
  • METEOROLOGY AND CLIMATOLOGY
  • 1980-1984
  • 1975-1979  (88)
  • 1970-1974
  • 1960-1964
  • 1940-1944
  • 1976  (88)
Collection
Keywords
Publisher
Years
  • 1980-1984
  • 1975-1979  (88)
  • 1970-1974
  • 1960-1964
  • 1940-1944
Year
  • 1
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    Optical observation of WRA 977 (3U 1233-62?) (1976)
    In:  CASI
    Details
    Publication Date: 2006-04-18
    Description: UBV photometry of WRA 977 on 36 nights between January and July of 1974 shows that this object is active on a time scale of days at the 0.1 mag level, but that it remains quite constant during monitoring intervals lasting up to 1 hour. Periodogram analysis reveals no significant periodic variation in the brightness of this object.
    Keywords: ASTRONOMY
    Type: NASA. Goddard Space Flight Center X-ray Binaries; p 677-682
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Test of the principle of operation of a wideband magnetic direction finder for lightning return strokes (1976)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: The principle of operation of a wideband crossed-loop magnetic-field direction finder is studied by comparing the bearing determined from the NS and EW magnetic fields at various times up to 155 microsec after return stroke initiation with the TV-determined lightning channel base direction. For 40 lightning strokes in the 3 to 12 km range, the difference between the bearings found from magnetic fields sampled at times between 1 and 10 microsec and the TV channel-base data has a standard deviation of 3-4 deg. Included in this standard deviation is a 2-3 deg measurement error. For fields sampled at progressively later times, both the mean and the standard deviation of the difference between the direction-finder bearing and the TV bearing increase. Near 150 microsec, means are about 35 deg and standard deviations about 60 deg. The physical reasons for the late-time inaccuracies in the wideband direction finder and the occurrence of these effects in narrow-band VLF direction finders are considered.
    Keywords: METEOROLOGY AND CLIMATOLOGY
    Type: Journal of Applied Meteorology; 15; Apr. 197
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    Diurnal stratospheric tide in meridional wind, 30 to 60 km, by season (1976)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: The diurnal component in meridional wind is estimated for each season at twelve rocket stations. Amplitudes and phases are presented as a function of height-latitude or as vertical profiles. Many of the gross features of the tide persist throughout the year, but as they migrate in height and latitude the amplitude or phase at a given location may undergo large changes with season. Longitudinal variations in the diurnal tide are found in the mid-stratosphere, and it is suggested they are coupled with longitudinal variations in the tropospheric temperature structure.
    Keywords: METEOROLOGY AND CLIMATOLOGY
    Type: Journal of the Atmospheric Sciences; 33; Feb. 197
    Format: text
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  • 4
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    A study of meteor spectroscopy and physics from earth-orbit: A preliminary survey into ultraviolet meteor spectra (1976)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Preliminary data required to extrapolate available meteor physics information (obtained in the photographic, visual and near ultraviolet spectral regions) into the middle and far ultraviolet are presented. Wavelength tables, telluric attenuation factors, meteor rates, and telluric airglow data are summarized in the context of near-earth observation vehicle parameters using moderate to low spectral resolution instrumentation. Considerable attenuation is given to the problem of meteor excitation temperatures since these are required to predict the strength of UV features. Relative line intensities are computed for an assumed chondritic composition. Features of greatest predicted intensities, the major problems in meteor physics, detectability of UV meteor events, complications of spacecraft motion, and UV instrumentation options are summarized.
    Keywords: ASTRONOMY
    Type: NASA-CR-2664
    Format: application/pdf
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  • 5
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    An Atlas of extraterrestrial particles collected with NASA U-2 aircraft, 1974 - 1976 (1976)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Extraterrestrial particles collected during U-2 flights in the stratosphere were divided into four groups: chondritic, iron-sulfur--nickel, mafic silicates, and others. The chondritic aggregates are typically composed of Fe, Mg, Si, C, S, Ca, and Ni. Detectable levels of He-4 implanted from the solar wind occur in some. Olivine, spinel, and possibly pyrrhotite and a hydrated layered-lattice silicate were identified. The chondritic ablation particles contain no sulfur and appear to have been melted. Magnetite, olivine, and pyroxene were identified. The iron-sulfur-nickel type particles resemble meteoritic iron sulfide with a small amount of nickel, and contain magnetite and troilite. The mafic silicate type particles are iron magnesium silicate grains with clumps of chondritic aggregate particles adhering to their surfaces. Olivine and possibly pyrrhotite and pyroxene were identified. Most of the iron-nickel type particles are spherules and include taenite and wustite. The other type particles include nickel-iron mounds on spheroidal glassy-like grains having chondritic-like elemental abundances.
    Keywords: ASTRONOMY
    Type: NASA-TM-X-73152 , A-6672
    Format: application/pdf
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  • 6
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    The ultraviolet variations of Iota Cassiopeiae (1976)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Keywords: ASTRONOMY
    Type: Astrophysical Journal; 209; Oct. 1
    Format: text
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  • 7
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    Interplanetary scintillation observations with the Cocoa Cross radio telescope (1976)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: Physical and electrical parameters for the 34.3-MHz Cocoa Cross radio telescope are given. The telescope is dedicated to the determination of solar-wind characteristics in and out of the ecliptic plane through measurement of electron-density irregularity structure as determined from IPS (interplanetary scintillation) of natural radio sources. The collecting area (72,000 sq m), angular resolution (0.4 deg EW by 0.6 deg NS), and spatial extent (1.3 km EW by 0.8 km NS) make the telescope well suited for measurements of IPS index and frequency scale for hundreds of weak radio sources without serious confusion effects.
    Keywords: ASTRONOMY
    Type: Journal of Geophysical Research; 81; Feb. 1
    Format: text
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  • 8
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    MX 1313+29 - A compact source of very low energy X-rays in Coma Berenices (1976)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: A compact X-ray source near the North Galactic Pole has been detected with the low-energy X-ray telescope aboard the SAS-3 satellite. The spectral temperature of the source is less than 1 million K, and the energy flux at the earth is 3 by 10 to the -10th power erg/sq cm/sec above 0.1 keV. The flux appeared to be constant both on short time scales (10-1000 s), and over the interval from the first SAS-3 observation (June 12, 1975) to the latest (July 15, 1975). The possible identification of this source with the hot white dwarf HZ 43 is discussed.
    Keywords: ASTRONOMY
    Type: Astrophysical Journal; 203; Jan. 1
    Format: text
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  • 9
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    The ultraviolet variations of iota Cas (1976)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: The Ap variable star iota Cas was observed with the photometers on OAO-2 covering the spectral range 1430-4250 A. The ultraviolet light curves show a double wave with primary minimum and maximum at phase ? 0.00 and 0.35, respectively. Secondary minimum light is at phase ? 0.65 with secondary maximum at phase ? 0.85. The light curves longward of 3150 A vary in opposition to those shortward of this 'null region'. Ground-based coude spectra show that the Fe II and Cr II line strengths have a double-wave variation such that maximum strength occurs at minimum ultraviolet light. We suggest that the strong ultraviolet opacities due to photoionization and line blanketing by these metals may cause the observed photometric variations. We have also constructed an oblique-rotator model which shows iron and chromium lying in a great circle band rather than in circular spots.
    Keywords: ASTRONOMY
    Type: Colloquium on Physics of Ap-stars; Sep 08, 1975 - Sep 11, 1975; Vienna; Austria
    Format: text
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  • 10
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    Wind sets from SMS images - An assessment of quality for GATE (1976)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: The paper analyzes the accuracy, representativeness, and reproducibility of tracer winds in the 1974 GARP Atlantic Tropical Experiment whose data are used as ground truth. The tracer winds were generated by tracking clouds in SMS (Synchronous Meteorological Satellite) images. Data availability limits comparisons to satellite winds with ship winds at the surface and at 250 mb. Attention is focused on how accurately the cloud displacements can be measured and on the extent to which the cloud displacements represent the wind field. Operator errors in obtaining the cloud displacements are examined in a series of reproducibility tests and wind sets. Differences between proximate satellite and ship winds were all under 3 m/sec. Representativeness of cloud tracers for cumulus and cirrus level flow is found to be good within the accuracy of currently available ground truth data.
    Keywords: METEOROLOGY AND CLIMATOLOGY
    Type: Journal of Applied Meteorology; 15; Dec. 197
    Format: text
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