Galileo orbiter ultraviolet observations of Jupiter aurora

Details Galileo orbiter ultraviolet observations of Jupiter aurora Galileo orbiter ultraviolet observations of Jupiter aurora

Sep 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998jgr...10320125a&link_type=abstract

Journal of Geophysical Research, Volume 103, Issue E9, p. 20125-20148

Physics

37

Atmospheric Composition And Structure: Airglow And Aurora

Scientific paper

In 1996 during the first four orbits of the satellite tour the Galileo ultraviolet spectrometer (UVS) (1130-4320 Å) and extreme ultraviolet spectrometer: (EUVS) (540-1280 Å) performed near-simultaneous observations of the Jupiter aurora in both the north and south polar regions. These observations are modeled to provide the absolute surface brightness of the aurora from the H2 Rydberg Systems (B,B',B'',C,D,D'->X band systems). The spectral distribution and brightness of the EUV aurora are sensitive to H2 abundance, H2 temperature, and CH4 abundance. Analysis of the emission spectra indicates that the EUV aurora (800-1200 Å) are produced over a range of altitudes corresponding to slant column abundances of H2 from 1016 to 1020cm-2 or greater. The UVS spectra of the far ultraviolet (FUV) from 1130 to 1700 Å are optically thin in H2, but highly sensitive to the CH4 column abundance and to the secondary electron energy distribution. The slant column abundance of CH4 absorbers found from models of the FUV spectra varied in the range 0-10×1016cm-2, indicating the presence of both high altitude aurora, at or above the homopause, and deep aurora. The FUV spectra show C2H2 absorption bands near 1520 Å. The surface brightness of the aurora from the H2 Rydberg Systems ranged from 100 to 600 kR and of H Lyman α was 60 to 130 kR for a 2000 km wide oval. The total power input to the atmosphere from particle deposition is estimated to be ~1×1014W.

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