Analysis of Saturn kilometric radiation near a source center

J. D. Menietti; R. L. Mutel; P. Schippers; S. -Y. Ye; D. A. Gurnett; L. Lamy

doi:10.1029/2011JA017056

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Analysis of Saturn kilometric radiation near a source center

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Analysis of Saturn kilometric radiation near a source center

J. D. Menietti, R. L. Mutel, P. Schippers, S. -Y. Ye, D. A. Gurnett and L. Lamy

Journal of geophysical research. Space physics, Vol.116(A12), p.n/a

12/2011

DOI: 10.1029/2011JA017056

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Abstract

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.

Astronomy & Astrophysics

Physical Sciences

Science & Technology

Details

Title: Subtitle: Analysis of Saturn kilometric radiation near a source center
Creators: J. D. Menietti - University of Iowa
R. L. Mutel - University of Iowa
P. Schippers - University of Iowa
S. -Y. Ye - University of Iowa
D. A. Gurnett - University of Iowa
L. Lamy - Délégation Paris 7
Resource Type: Journal article
Publication Details: Journal of geophysical research. Space physics, Vol.116(A12), p.n/a
DOI: 10.1029/2011JA017056
ISSN: 2169-9380
eISSN: 2169-9402
Publisher: Amer Geophysical Union
Number of pages: 10
Grant note: Observatoire de Paris CNRS; Centre National de la Recherche Scientifique (CNRS) 1415150 / NASA; National Aeronautics & Space Administration (NASA) CNES; Centre National D'etudes Spatiales Jet Propulsion Laboratory
Language: English
Date published: 12/2011
Academic Unit: Physics and Astronomy
Record Identifier: 9984627197802771

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