Physics
Scientific paper
Dec 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010agufm.p11a1322c&link_type=abstract
American Geophysical Union, Fall Meeting 2010, abstract #P11A-1322
Physics
[5704] Planetary Sciences: Fluid Planets / Atmospheres, [6220] Planetary Sciences: Solar System Objects / Jupiter
Scientific paper
High resolution spectra of Jupiter’s Lyman-alpha bulge region taken from the Hubble Space Telescope Imaging Spectrograph have been reanalyzed to better characterize the hydrogen column density and the source of excess brightness in the region. It was shown that at the bulge, there is a hot hydrogen emission feature in the line profile below a cool hydrogen emission. This hot hydrogen layer was shown to be moving at supersonic speed with respect to the cool layer in the direction of planet rotation. Analysis of the anti-bulge region line profiles showed a similar atmospheric layering, but the hot hydrogen was moving more slowly but still with supersonic speed with respect to the cold layer. The spectra also show evidence of turbulence, indicative that a Voigt spectral distribution is not sufficient for describing the spectral width of the hot region. An optical depth analysis has shown that because of the broad spectral profile, the excess brightness can be explained without requiring a much higher column density of hydrogen in the bulge. This study supports the idea that the bulge region is caused by an asymmetry in Jupiter’s magnetosphere combined with equatorial electrojets in the upper atmosphere.
Clarke John T.
Corbin B. A.
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