Physics
Scientific paper
Dec 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agufmsm41b1666j&link_type=abstract
American Geophysical Union, Fall Meeting 2008, abstract #SM41B-1666
Physics
6009 Aurorae, Airglow, And X-Ray Emission, 6220 Jupiter
Scientific paper
Auroral emissions from Jupiter have been observed across the electromagnetic spectrum including ultraviolet and X-ray emissions. X-ray emissions with a total power of about 1GW were observed by the Einstein Observatory, the Roentgen satellite (ROSAT), Chandra X-ray Observatory (CXO), and XMM-Newton. Previous studies (Cravens et al. 1995, Kharchenko et al. 1998, 2006, and Liu and Schultz 1999) have shown that precipitating energetic sulfur and oxygen ions can produce the observed X-rays. Sulfur and oxygen ions in the outer magnetosphere are presumably accelerated by field-aligned potentials before they precipitate into the atmosphere (Cravens et al. 2003). Collisions with atmospheric neutrals remove most of the incident ions' orbital electrons and subsequent charge transfer collisions produce X-rays. This study theoretically models the ion precipitation using cross sections for these charge exchange processes and an empirical stopping power. X-ray luminosities are determined for several monoenergetic beams. Our model also shows the altitude dependence of the X-ray photons produced and accounts for the change in observed X-ray power due to opacity effects.
Cravens Thomas E.
Dalgarno Alexander
Jager N. O.
Kharchenko Vasili
Schultz David R.
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