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Analysis of plasma waves observed in the inner Saturn magnetosphere

Menietti, JD; Santolik, O; Rymer, AM; Hospodarsky, GB; Gurnett, DA; Coates, AJ; (2008) Analysis of plasma waves observed in the inner Saturn magnetosphere. ANN GEOPHYS-GERMANY , 26 (9) 2631 - 2644. Gold open access


Plasma waves observed in the Saturn magnetosphere provide an indication of the plasma population present in the rotationally dominated inner magnetosphere. Electrostatic cyclotron emissions often with harmonics and whistler mode emission are a common feature of Saturn's inner magnetosphere. The electron observations for a region near 5 R-S outside and near a plasma injection region indicate a cooler low-energy (100 eV), nearly isotropic plasma, and a much warmer (E>1000 eV) more pancake or butterfly distribution. We model the electron plasma distributions to conduct a linear dispersion analysis of the wave modes. The results suggest that the electrostatic electron cyclotron emissions can be generated by phase space density gradients associated with a loss cone that may be up to 20 degrees wide. This loss cone is sometimes, but not always, observed because the field of view of the electron detectors does not include the magnetic field line at the time of the observations. The whistler mode emission can be generated by the pancake-like distribution and temperature anisotropy (T-perpendicular to/TQ vertical bar vertical bar>1) of the warmer plasma population.

Title:Analysis of plasma waves observed in the inner Saturn magnetosphere
Open access status:An open access publication
Publisher version:http://www.annales-geophysicae.net
Keywords:magnetospheric physics, planetary magnetospheres, plasma waves and instabilities, space plasma physics, wave-particle interactions, ELECTRON ACCELERATION, CHORUS, EMISSIONS, RADIO
UCL classification:UCL > School of BEAMS > Faculty of Maths and Physical Sciences > Space and Climate Physics

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