First Analysis of the Galileo/NIMS Spectra of Jupiter in the 5 MU M Window

Details First Analysis of the Galileo/NIMS Spectra of Jupiter in the 5 MU M Window First Analysis of the Galileo/NIMS Spectra of Jupiter in the 5 MU M Window

Sep 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996dps....28.2110r&link_type=abstract

American Astronomical Society, DPS meeting #28, #21.10; Bulletin of the American Astronomical Society, Vol. 28, p.1135

Astronomy and Astrophysics

Astronomy

Scientific paper

We present a first analysis of Jupiter/NIMS spectra that were acquired during the June 1996 orbital pass of the Galileo spacecraft. The data consist of 4 real time spectra obtained at the edge, and within, a hot spot which occured at approximately the same latitude as that which the Galileo Probe entered. The spectra were taken in the LONG MAP MODE, giving spectra of 408 wavelengths between 0.7 mu m and 5.2 mu m with a resolution of 0.025 mu m. The spatial resolution is about 800 km/pixel. The 5 micron window (4.5 to 5.2 mu m) is of special interest as it traces levels down to 8 bars, and a special attempt is made to fit the NIMS spectra with the atmospheric parameters derived from the Galileo Probe measurements (Young et al., Science, 1996). The 4 NIMS spectra show differences in continuum level due to a change in cloud opacity in the hot spot region and just outside of it. With the use of an improved radiative transfer model, employed in previous interpretations of Voyager/IRIS spectra (Drossart et al., Icarus, 1982; Lellouch et al., Icarus, 1989) we investigate these variations and possible variations in the abundances of H_2O, NH_3, PH_3, GeH_4 and CH_3D. Introducing the vertical atmospheric structure found by the Galileo Probe as input parameters for our model, i.e. a thin cloud layer at 1.4 bars, a dry adiabatic T(p) profile, H_2 and He abundances and the vertical abundance profiles for H_2O, NH_3 and CH_4, we find that a highly subsaturated water abundance at levels between 2 and 8 bars reproduces the spectral features at 5 micron of the hot spot spectrum, without the presence of a deep water cloud invoked in previous studies.

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