Excitation of electron cyclotron harmonic waves in the inner Saturn magnetosphere within local plasma injections

Details Excitation of electron cyclotron harmonic waves in the inner Saturn magnetosphere within local plasma injections Excitation of electron cyclotron harmonic waves in the inner Saturn magnetosphere within local plasma injections

Dec 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010jgra..11512204t&link_type=abstract

Journal of Geophysical Research, Volume 115, Issue A12, CiteID A12204

Physics

Plasma Physics

Magnetospheric Physics: Plasma Waves And Instabilities (2471), Planetary Sciences: Solar System Objects: Saturn, Space Plasma Physics: Wave/Particle Interactions (2483, 6984)

Scientific paper

Strong electron cyclotron harmonic (ECH) waves have been observed by Cassini associated with local plasma injection regions in the Saturnian magnetosphere. Using measured electron distributions from the Cassini plasma spectrometer, we calculated local growth rates and path-integrated wave gain of ECH waves inside an injection event using the HOTRAY code. We showed that electrons with energy near a few eV have a collision frequency comparable to their bounce frequency; thus, they cannot have an empty loss cone. We then demonstrated that the growth of ECH waves inside the injection event can be driven by electron phase space density gradients associated with the loss cone distribution of injected electrons at energies between a few hundred eV and a few keV. This conclusion is contrary to previous results that the source of free energy for growth of ECH waves is provided by electrons near a few eV. Results in this work are helpful for understanding the generation of ECH waves and their roles in electron dynamics in the Saturnian magnetosphere.

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