Physics
Scientific paper
Aug 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994jgr....9914799w&link_type=abstract
Journal of Geophysical Research (ISSN 0148-0227), vol. 99, no. A8, p. 14,799-14,809
Physics
62
Auroras, Bremsstrahlung, Jupiter (Planet), Proportional Counters, Ions, Iue, Line Spectra, Particle Precipitation, Rosat Mission, X Ray Spectra
Scientific paper
Roentgen satellite (ROSAT) high-resolution imager (HRI) and position sensitive proportional counter (PSPC) observations of Jupiter obtained in April 1991 and May 1992 reveal soft X-ray emissions apparently associated with Jupiter's aurora and similar to X-ray emssions observed earlier by the Einstein Observatory. The HRI images show emission mainly from Jupiter's northern hemisphere at all Jovian longitudes observed, and there is some indication of a longitudinal modulation of the emission in phase with well-known ultraviolet modulation of the northern aurora. The PSPC data reveal a very soft spectrum. Comparison of the observed spectrum with models for both electron bremsstrahlung radiation and line emission from S and O ions indicates that the line spectrum gives a much better statistical fit to the observed spectrum. The X ray observations presented here therefore support the hypothesis that ion precipitation is the most likely cause of the Jovian X ray emissions, a result first suggested by the Einstein results (Metzger et al., 1983).
Alan Stern S.
Bagenal Fran
Clarke John T.
Cravens Thomas E.
Elsner Ronald
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