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  • Other Sources  (16)
  • 1
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    A detected feature at the expected wavelength for the HD R5(0) line in Jupiter's and Uranus' atmospheres (1986)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: A feature was detected at the expected wavelength for the HD R5(0) line in Jupiter's and Uranus' atmospheres. An upper limit for Neptune was also found. Added to the earlier detection of a similar feature for Saturn, it is proposed that all evidence from this type of measurement can be interpreted as arising from a D/H ratio of about .0004 for all the major planets. This value is not in agreement with measurements from CH3D transitions, and is at least fifty times the accepted interstellar medium value of 5 x .000001, implying deuterium enhancement in the solar system via fractionation in the proto-solar nebula.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: NASA. Goddard Inst. for Space Studies The Jovian Atmospheres; p 110
    Format: application/pdf
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  • 2
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    Elmira soaring contest, 1930 (1931)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: This report details the Elmira, New York soaring contest of 1930 and provides up-current maps, experiences in piloting, distance flights, and a few details on glider design.
    Type: NACA-TM-613
    Format: application/pdf
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  • 3
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    A search for interstellar H2O(+) in diffuse clouds (1984)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: Searches for H2O(+) toward HD 187982, Zeta Oph, O micron Per, and Zeta Per have yielded significant upper limits for H2O(+) when compared with existing models for similar lines of sight. Using available oscillator strength data, the column density for HD 187982, for example, cannot exceed 3 x 10 to the 12th per sq cm H2O(+) molecules. The most sensitive measurement for H2O(+) toward Zeta Oph is apparently limited by a blend with upper atmospheric H2O(+), which is also present in the HD 187982 spectrum.
    Keywords: ASTROPHYSICS
    Type: Astrophysical Journal, Part 1 (ISSN 0004-637X); 277; 196-199
    Format: text
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  • 4
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    On the detection of rubidium in diffuse interstellar clouds (1985)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: A search for absorption from neutral rubidium at 7800 A was conducted. No evidence for absorption to a 3 sigma limit of less than 1.5 mA was seen in the diffuse interstellar gas toward the stars omicron Persei, zeta Persei, and zeta Ophiuchi. Present results do not confirm the detection by Jura and Smith (1981) toward zeta Oph. A possible reason for the discrepancy is presented. In light of the present measurements, the abundance of interstellar rubidium in reconsidered.
    Keywords: ASTROPHYSICS
    Type: Astrophysical Journal, Part 2 - Letters to the Editor (ISSN 0004-637X); 290; L55-L58
    Format: text
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  • 5
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    High resolution observations of linear polarization of the 6818.8 A feature of methane for Uranus and Saturn (1984)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: Observations of the linear polarization in the fully resolved 6818.8 A feature of CH4 in Saturn and Uranus show dramatic changes of linear polarization across the line profile. The change in position angle of polarization across the line core, especially for Saturn, indicates a likely Rayleigh scattering origin for the observed polarization.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Icarus (ISSN 0019-1035); 57; 228-230
    Format: text
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  • 6
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    High-resolution observations of the 6815-A band of methane in the major planets (1983)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: High-resolution (0.1-A) spectra of the 6815-A band of methane are presented for Jupiter, Saturn, Uranus, and Neptune. Spectra for Uranus, Neptune, and the equatorial region of Saturn were acquired with the SPIFI (Smith, Hicks, and Born (1978) at the 2.2-m telescope of the Mauna-Kea Observatory during May and June 1980. Additional spectra were obtained for Jupiter and the northern temperate and polar regions of Saturn in December 1980 and January 1981 from Kitt Peak National Obsevatory's McMath Solar Telescope. The spectra show a dichotomy in strength of methane absorption between Jupiter-Saturn and Uranus-Neptune. A simple model analysis, based on homogeneous scattering models, is unable to resolve whether this dichotomy is due to an actual increase in the methane mixing ratio with solar distance or to the temperature dependence of line strengths and absorption pathlengths in these atmospheres. If the rotational quantum number for the prominent 6818.9-A feature is J less than 4, then significant aerosol extinction must exist within the visibly accessible portion of Uranus' atmosphere for the methane mixing ratio to be greater than the solar value.
    Keywords: ASTRONOMY
    Type: Icarus (ISSN 0019-1035); 56; 534-542
    Format: text
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  • 7
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    Jovian sodium emission from Region C2 (1979)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: Observations of emission from sodium presumed to have been ejected from Io in the orbital plane of the Gallilean satellites and extending outward to at least 35 Jupiter radii are reported. Spectra of the sodium D line were observed to have an intensity of 20 to 30 R. Mechanisms for the escape of sodium from Io after sputtering from the surface are: (1) ejection from Io at velocities greater than Jupiter escape velocity, (2) ejection at velocities corresponding to orbits with apoapses of 35 Jupiter radii, and (3) ionization followed by magnetic field sweeping and recombination. The relative contributions of each mechanism are estimated and used to predict the sodium emission intensity at 35 Jupiter radii to be 7 to 8 R, a value considered to be in reasonable agreement with observations. Observations of emission line width and the correlation of intensity with the orbital phase of Io would provide further means of evaluating the proposed mechanisms of sodium ejection.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Icarus; 38; Apr. 197
    Format: text
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  • 8
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    The D/H ratio for Jupiter (1989)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: Observations of Jupiter's spectrum near the R5(0) HD line at 6063.88 A are reported. A feature with an equivalent width of 0.065 + or - 0.021 mA is coincident with the expected line. This feature is compared with HD profiles computed for inhomogeneous scattering models for Jupiter to yield a range for the Jovian D/H ratio of 1.0-2.9 x 10 to the -5th. This D/H ratio is in the lower range of previously reported D/H values for Jupiter and corresponds to an essentially solar D/H ratio for Jupiter. The detection of HD features in the presence of probable blends with spectral features of minor atmospheric hydrocarbon molecules is discussed. Such blends may make unambiguous identification of HD features difficult.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Astrophysical Journal, Part 1 (ISSN 0004-637X); 336; 967-970
    Format: text
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  • 9
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    D/H for Uranus and Neptune (1989)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: Searches for absorption features of HD near 6050 A are reported for Uranus and Neptune. The existence of blends of the HD features with weak features due to minor species in the atmosphere of Uranus is demonstrated. These blends make the unambiguous identification of the weak HD features exceedingly difficult. The data are analyzed with inhomogeneous scattering models to ascertain a D/H upper limit for Uranus and Neptune of 0.0001, a factor of 2 smaller than the upper limit reported from CH3D measurements.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Astrophysical Journal, Part 1 (ISSN 0004-637X); 336; 962-966
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  • 10
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    Limits on the diurnal variation of H2 quadrupole features in Neptune (1989)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: Spectral profiles of the H2 S4(0) and S4(1) lines are presented for Neptune on three consecutive nights; no variation is detected in the equivalent widths of the H2 4-0 features to within an observational uncertainty of about 20 percent. Comparisons with previous H2 quadrupole observations indicate that no secular trends have been detected over about 15 yr. The equivalent-width error limits are interpreted in terms of the maximum variability of Neptunian tropospheric aerosols. Specifically, the error bars for the globally averaged equivalent widths of the two H2 quadrupole absorption features constrain the bottom of the visible atmosphere, as defined by a bright optically infinite isotropically scattering cloud, to be 2.9 + or - 0.6 bars, while the methane haze opacity is constrained to be 0.30 + or - 0.25.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Astrophysical Journal, Part 1 (ISSN 0004-637X); 343; 450-455
    Format: text
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