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  • LUNAR AND PLANETARY EXPLORATION  (190)
  • 1980-1984  (190)
  • 1940-1944
  • 1982  (190)
  • 1
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    Far-infrared spectrophotometry of Saturn and its rings (1982)
    In:  Other Sources
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    Publication Date: 2011-08-18
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Icarus; 51; Sept
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  • 2
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    Infrared heterodyne spectroscopy (1982)
    In:  Other Sources
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    Publication Date: 2011-08-18
    Description: Infrared heterodyne spectroscopy is an extremely useful tool for Doppler-limited studies of atomic and molecular lines in diverse astrophysical regions. The current state of the art is reviewed, and the analysis of CO2 lines in the atmosphere of Mars is outlined. Doppler-limited observations have enabled the discovery of natural laser emission in the mesosphere of Mars and the discovery of failure of local thermodynamic equilibrium near the surface of Mars.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Optical Engineering; 21; Mar
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  • 3
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    Infrared observations of the Saturnian system from Voyager 2 (1982)
    In:  Other Sources
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    Publication Date: 2011-08-18
    Description: During the passage of Voyager 2 through the Saturn system, infrared spectral and radiometric data were obtained for Saturn, Titan, Enceladus, Tethys, Iapetus, and the rings. Combined Voyager 1 and Voyager 2 observations of temperatures in the upper troposphere of Saturn indicate a seasonal asymmetry between the northern and southern hemispheres, with superposed small-scale meridional gradients. Comparison of high spatial resolution data from the two hemispheres poleward of 60 deg latitude suggests an approximate symmetry in the small-scale structure, consistent with the extension of a symmetric system of zonal jets into the polar regions. Longitudinal variations of 1 to 2 K are observed. Disk-averaged infrared spectra of Titan show little change over the 9-month interval between Voyager encounters. By combining Voyager 2 temperature measurements with ground-based geometric albedo determinations, phase integrals of 0.91 plus or minus 0.13 and 0.89 plus or minus 0.09 were derived for Tethys and Enceladus, respectively. The subsolar point temperature of dark material on Iapetus must exceed 110 K. Temperatures (and infrared optical depths) for the A and C rings and for the Cassini division are 69 plus or minus 1 K (0.40 plus or minus 0.05), 85 plus or minus 1 K (0.10 plus or minus 0.03), and 85 plus or minus 2 K (0.07 plus or minus 0.04), respectively.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Science; 215; Jan. 29
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  • 4
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    Evidence for high-altitude haze thickening on the dark side of Venus from 10-micron heterodyne spectroscopy of CO2 (1982)
    In:  Other Sources
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    Publication Date: 2011-08-18
    Description: Infrared heterodyne spectroscopy provides data for isolated spectral lines with a spectral resolution which is small compared to the Doppler width. Heterodyne spectroscopy of CO2 lines near 10 micrometers was first reported for the atmosphere of Venus by Betz et al. (1976). The present investigation is concerned with observations of two absorption lines of (C-12)(O-16)2 conducted with an infrared heterodyne spectrometer interfaced with a solar telescope. The 10.8598-micrometer P(44) line was observed on the day side of Venus and the 10.3337-micrometer R(8) line was observed on the night side. It is shown that continuous opacity due to haze, and possible departures from vibrational LTE in CO2, are crucial considerations in fitting the observed lines.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Icarus; 49; Jan. 198
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  • 5
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    Chronology and petrogenesis of young achondrites, Shergotty, Zagami, and ALHA77005 - Late magmatism on a geologically active planet (1982)
    In:  Other Sources
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    Publication Date: 2011-08-18
    Description: Three achondrites were examined for chronology, petrogenesis, and relationships among the shergotites. Isotopic and trace elements analyses were carried out through neutron activation and mass spectrometry on Shergotty, Zagami, and ALHA77005 samples. Attention was given the Rb-Sr, Sm-Nd, and the Ar-39/Ar-40 ages in the samples. Evidence was detected for a shock metamorphism and a younger age of the meteorites than with most other achondrites. Depletions of the rare-earth elements were observed in Shergotty and Zagami, and to a more pronounced degree in ALHA77005. The Rb-Sr internal isochrons for all three meteorites were about 180 Myr, while the Ar-39/Ar-40 plateau ages of Shergotty and Zagami maskelynite were determined at 250-260 Myr. No precise identification of the crystallization ages was found. It is suggested that the achondrites originated in a parent body which experienced at least two epochs of sustained melting.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Geochimica et Cosmochimica Acta; 46; Nov. 198
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  • 6
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    Observations of Jupiter's distant magnetotail and wake (1982)
    In:  Other Sources
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    Publication Date: 2019-06-28
    Description: Results are presented for Voyager 2 plasma wave and plasma measurements, obtained during mid-1980 to August 1981, which indicate the existence of clear signatures of Jovian nonthermal continuum radiation while the spacecraft was in the general downstream direction from Jupiter up to distances of approximately 4.5 AU. A periodicity indicating some solar wind control was indicated by the increasing magnitude and duration of the events as Voyager 2 approached the nominal aberrated tail position in the spring of 1981. It is found that each event shows characteristics suggestive of electromagnetic radiation trapped within a low-density cavity. Several of the events are characterized by a broad, moderately low density region surrounding a well-defined, very low density core. It is concluded that this series of continuum radiation events is best interpreted as the passage of Voyager 2 through the extended magnototail and wake of Jupiter. In addition, the various allowed tail configurations consistent with the observations are examined.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: AD-A123812 , Journal of Geophysical Research; 87; Dec. 1
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  • 7
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    Fabry-Perot/CCD observations of /S III/ and /S II/ emissions from the Jupiter plasma torus (1982)
    In:  Other Sources
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    Publication Date: 2019-06-28
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Astrophysical Journal; vol. 259
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  • 8
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    Cosmogenic nuclides in recently fallen meteorites - Evidence for galactic cosmic ray variations during the period 1967-1978 (1982)
    In:  Other Sources
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    Publication Date: 2019-06-28
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Journal of Geophysical Research; 87; July 10
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  • 9
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    Low-level VLF and LR radio emissions observed at earth and Jupiter (1982)
    In:  Other Sources
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    Publication Date: 2019-06-28
    Description: Major observational features of magnetospheric VLF-LF radio noise that have been uncovered by the IMP, Hawkeye and ISEE satellites, are examined with emphasis on the capabilities of the noise to diagnose local and remote plasma parameters. The relationship of the radiation to not less than 1-mV/m electrostatic upper hybrid emissions is assessed, and indirect observational evidence suggests that upper noise is associated with the generation of the VLF-LF radiation. Theoretical luminosities of mechanisms including synchrotron radiation, linear mode conversion of upper hybrid waves and nonlinear scattering of upper hybrid waves off plasma density irregularities are estimated, and the wave-wave scattering hypothesis is considered to be a viable mechanism if the presence of low-frequency waves as a scattering agent can be established.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Reviews of Geophysics and Space Physics; 20; May 1982
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  • 10
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    Multi-ion resonances in finite temperature plasma (1982)
    In:  Other Sources
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    Publication Date: 2019-06-28
    Description: Dispersion properties of electrostatic waves in a multi-ion plasma are examined, with an analysis that incorporates the effects of finite temperature, finite parallel wavenumber, and wave growth/damping in a systematic development of equations. Numerical solutions and analytic formulas are given for an ion plasma consisting of H(+), O(+), and S(+) for application to Jupiter's magnetosphere. It is demonstrated how observations of plasma resonance lines may be used as a diagnostic of ion composition in magnetospheric plasma. This potential use of high-sensitivity/high-resolution plasma wave instrumentation may provide information necessary to resolve issues concerning the origin of plasmas in the earth's neighborhood.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Astrophysical Journal; vol. 254
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