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  • 1
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    The abundances of ethane to acetylene in the atmospheres of Jupiter and Saturn (1986)
    In:  CASI
    Details
    Publication Date: 2013-08-31
    Description: The present determination of the stratospheric abundances of ethane and acetylene on Jupiter and Saturn on the basis of IR spectra near 780/cm uses atmospheric models whose thermal and density profiles have constant mixing ratios. The ratio of ethane to acetylene is noted to be insensitive to model atmosphere assumptions; it is 55 + or - 31 for Jupiter and 23 + or - 12 where model mixing ratios are uniform. Atmospheric model density profiles adapted from theoretical photochemical models are noted to also yield a higher ethane/acetylene ratios for Jupiter.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: NASA. Goddard Inst. for Space Studies The Jovian Atmospheres; p 109
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 2
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    The detection of HCN on Jupiter (1981)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: The detection of HCN on Jupiter is reported. Three R-branch lines of the nu-2 fundamental of HCN near 13.5 microns were observed in absorption, from which the HCN column density is inferred to be 0.005 cm-am with an uncertainty of a factor of two. If emission from the stratosphere exists, then the derived column density is only a lower limit. It is suggested that the Jovian HCN most likely originates from the photolysis of CH4 and NH3 in the lower stratosphere and upper troposphere. In addition, an upper limit of 0.025 cm-am was established for the column density of HCN on Saturn.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Icarus; 48; Nov. 198
    Format: text
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  • 3
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    Enhanced acetylene emission near the north pole of Jupiter (1986)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: The present paper is concerned with observations of acetylene fundamental and hot band vibrational emission lines from the planet Jupiter. It is pointed out that the observation of a polar bright spot in the atmosphere of Jupiter is characterized by an enhancement in the individual lines of C2H2 which can be interpreted as an enhancement in the acetylene abundance. However, a purely thermal effect, or non-LTE phenomena cannot be excluded. The intensity of the observed hot band lines is also consistent with either hypothesis. The reported observations were performed with a cooled Fabry-Perot Grating Spectrometer (FPGS). Observations and instrumentation are considered in detail along with the calculation of synthetic spectra on the basis of a line-by-line computation, and the interpretation of the obtained data.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Icarus (ISSN 0019-1035); 66; 610-618
    Format: text
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    NASA TECHNICAL REPORTS
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