Analysis of Saturn kilometric radiation near a source center

Details Analysis of Saturn kilometric radiation near a source center Analysis of Saturn kilometric radiation near a source center

Dec 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011jgra..11612222m&link_type=abstract

Journal of Geophysical Research, Volume 116, Issue A12, CiteID A12222

Physics

Plasma Physics

Magnetospheric Physics: Plasma Waves And Instabilities (2471), Planetary Sciences: Fluid Planets: Magnetospheres (2756), Space Plasma Physics: Wave/Particle Interactions (2483, 6984)

Scientific paper

The Cassini spacecraft flew very near a source region of Saturn kilometric radiation (SKR) on day 73 of 2008, the second known encounter with a source region at high latitude. The radio and plasma wave instrument, Radio and Plasma Wave Science, observed intense kilometric emission in the extraordinary X mode, ordinary O mode, and Z mode. The electron low-energy spectrometer obtained a phase space distribution of sufficient energy and pitch angle resolution to allow growth rate calculations. There is evidence of a shell-like electron plasma distribution that is unstable to the growth of SKR via the cyclotron maser instability. The growth rates calculated are adequate to explain the observed X and Z mode emission, but nonlinear effects are required to explain the large O mode gain (as is true for terrestrial observations). Narrowband emission, also present at the time, could also explain both the Z mode and the O mode. We present the results for comparison with a previously reported source region encounter and with similar observations at Earth auroral kilometric source regions.

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