Physics
Scientific paper
May 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004agusmsm11a..04s&link_type=abstract
American Geophysical Union, Spring Meeting 2004, abstract #SM11A-04
Physics
2704 Auroral Phenomena (2407), 5737 Magnetospheres (2756), 6220 Jupiter
Scientific paper
In a standard picture of Jupiter's MI coupling [Hill, 1979], steady-state field aligned electric currents mediate angular momentum from Jupiter's ionosphere into Jupiter's middle magnetosphere to spin up the radially expanding magnetospheric plasma. These currents have been linked by Cowley & Bunce [2001] and Hill [2001] to the main auroral oval on Jupiter. In an alternative approach, Saur et al. [2002] showed that on the auroral field lines the intensity of small scale Alfven waves (identified as weak MHD turbulence) maximizes. Saur et al. [2002] relate these dynamic fluctuations in the presence of a net background current to the generation of the main auroral oval. Their description leads to a total energy in the accelerated electrons and a field aligned voltage in agreement with the observations of the aurora oval. In our talk we review both descriptions and discuss in particular overlapping and discriminating features. We will also compare the current ideas for the Jupiter system with understanding and observations at Earth. Aurorae at Earth are often divided in three regions/phenomena: A region with upward going current, one with downward going current, and an Alfven aurora.
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