Physics
Scientific paper
Apr 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011jgra..11604227b&link_type=abstract
Journal of Geophysical Research, Volume 116, Issue A4, CiteID A04227
Physics
3
Planetary Sciences: Solar System Objects: Saturn
Scientific paper
Using a kinetic theoretical approach, the characteristics of electron acoustic waves (EAWs) are investigated in plasmas whose electron velocity distributions are modeled by a combination of two kappa distributions, with distinct densities, temperatures, and $\kappa$ values. The model is applied to Saturn's magnetosphere, where the electrons are well fitted by such a double-kappa distribution. The results of this model suggest that EAWs will be weakly damped in regions where the hot and cool electron densities are approximately equal, the hot to cool temperature ratio is about 100, and the kappa indices are roughly constant, with $\kappa$c $\simeq$ 2 and $\kappa$h $\simeq$ 4, as found in Saturn's outer magnetosphere (R ˜ 13-18 RS, where RS is the radius of Saturn). In the inner magnetosphere (R < 9 RS), the model predicts strong damping of EAWs. In the intermediate region (9-13 RS), the EAWs couple to the electron plasma waves and are weakly damped.
Baluku T. K.
Hellberg Manfred A.
Mace Richard L.
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