Analysis of plasma waves observed in the inner Saturn magnetosphere

J. D. Menietti; O. Santolik; A. M. Rymer; G. B. Hospodarsky; D. A. Gurnett; A. J. Coates

doi:10.5194/angeo-26-2631-2008

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Analysis of plasma waves observed in the inner Saturn magnetosphere

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Analysis of plasma waves observed in the inner Saturn magnetosphere

J. D. Menietti, O. Santolik, A. M. Rymer, G. B. Hospodarsky, D. A. Gurnett and A. J. Coates

Annales geophysicae (1988), Vol.26(9), pp.2631-2644

09/01/2008

DOI: 10.5194/angeo-26-2631-2008

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Abstract

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.

Astronomy & Astrophysics

Geology

Geosciences, Multidisciplinary

Meteorology & Atmospheric Sciences

Physical Sciences

Science & Technology

Details

Title: Subtitle: Analysis of plasma waves observed in the inner Saturn magnetosphere
Creators: J. D. Menietti - University of Iowa
O. Santolik - Czech Academy of Sciences, Institute of Atmospheric Physics
A. M. Rymer - Johns Hopkins University Applied Physics Laboratory
G. B. Hospodarsky - University of Iowa
D. A. Gurnett - University of Iowa
A. J. Coates - University College London
Resource Type: Journal article
Publication Details: Annales geophysicae (1988), Vol.26(9), pp.2631-2644
DOI: 10.5194/angeo-26-2631-2008
ISSN: 0992-7689
eISSN: 1432-0576
Publisher: Copernicus Gesellschaft Mbh
Number of pages: 14
Grant note: PP/E001173/1 / STFC; UK Research & Innovation (UKRI); Science & Technology Facilities Council (STFC) 030719/KONTAKT ME 842 / NSF; National Science Foundation (NSF) IAA 301120601 / GAAV; Grant Agency of the Czech Republic PP/D00084X/1 / UK Space Agency 1279973 / Jet Propulsion Laboratory; National Aeronautics & Space Administration (NASA) PP/E001173/1 / Science and Technology Facilities Council; UK Research & Innovation (UKRI); Science & Technology Facilities Council (STFC)
Language: English
Date published: 09/01/2008
Academic Unit: Physics and Astronomy
Record Identifier: 9984455261802771

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