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  • 1990-1994  (4)
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  • 1
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    Sulfur Dioxide in the Atmosphere of Venus (1994)
    Elsevier
    Details
    Publication Date: 1994-12-01
    Print ISSN: 0019-1035
    Electronic ISSN: 1090-2643
    Topics: Physics
    Published by Elsevier
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    PAPER CURRENT
  • 2
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    Optical design of the Ultraviolet Imaging Spectrograph for the Cassini mission to Saturn (1992)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: When the Cassini spacecraft arrives at Saturn early in the next century it will carry an Ultraviolet Imaging Spectrograph (UVIS). Observations made with the UVIS will support a broad set of scientific investigations including spectroscopy, imaging, and occultations. The UVIS consists of three spectroscopic channels covering the wavelength ranges 55-115 nm, 115-190 nm, and 160-320 nm. Each channel has an off-axis parabolic telescope followed by a toroidal grating spectrograph and an imaging microchannel plate-CODACON detector. The UVIS configuration was selected as a balanced solution to a large number of engineering and scientific constraints. We describe these constraints, the optical design, and the anticipated performance of the instrument.
    Keywords: SPACECRAFT INSTRUMENTATION
    Type: In: Instrumentation for planetary and terrestrial atmospheric remote sensing; Proceedings of the Meeting, San Diego, CA, July 23, 24, 1992 (A93-27076 09-35); p. 26-38.
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    Sulfur dioxide in the atmosphere of Venus. 1: Sounding rocket observations (1994)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: In this paper we present ultraviolet reflectance spectra obtained during two sounding rocket observations of Venus made during September 1988 and March 1991. We describe the sensitivity of the derived reflectance to instrument calibration and show that significant artifacts can appear in the spectrum as a result of using separate instruments to observe both the planetary radiance and the solar irradiance. We show that sulfur dioxide is the primary special absorber in the 190-230 nm region and that the range of altitudes probed by these wavelengths is very sensitive to incidence and emission angles. In a following paper Na et al. (1994) show that sulfur monixide features are also present intese data. Accurate identification and measurement of additional species require observations in which both the planetary radiance and the solar irradiance are measured with the same instrument. The instrument used for these observations is uniquely suited for obtaining large phase angle coverage and for studying transient atmospheric events on Venus because it can observe targents within 18 deg of the Sun while Earth-orbiting instruments are restricted to solar elongation angles greater than or equal to 45 deg.
    Keywords: ASTRONOMY
    Type: Icarus (ISSN 0019-1035); 112; 2; p. 382-388
    Format: text
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    NASA TECHNICAL REPORTS
  • 4
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    Sulfur dioxide in the atmosphere of Venus 1 sounding rocket observations (1994)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: In this paper we present ultraviolet reflectance spectra obtained during two sounding rocket observations of Venus made during September 1988 and March 1991. We describe the sensitivity of the derived reflectance to instrument calibration and show that significant artifacts can appear in that spectrum as a result of using separate instruments to observe both the planetary radiance and the solar irradiance. We show that sulfur dioxide is the primary spectral absorber in the 190 - 230 nm region and that the range of altitudes probed by these wavelengths is very sensitive to incidence and emission angles. In a following paper Na et. al. (1994) show that sulfur monoxide features are also present in these data. Accurate identification and measurement of additional species require observations in which both the planetary radiance and the solar irradiance are measured with the same instrument. The instrument used for these observations is uniquely suited for obtaining large phase angle coverage and for studying transient atmospheric events on Venus because it can observe targets within 18 deg of the sun while earth orbiting instruments are restricted to solar elongation angles greater than or equal to 45 deg.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: NASA-CR-195224 , NAS 1.26:195224
    Format: application/pdf
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    NASA TECHNICAL REPORTS
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