Short periodicities in low-frequency plasma waves at Saturn

J. F. Carbary; W. S. Kurth; D. G. Mitchell

doi:10.1002/2016JA022732

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Short periodicities in low-frequency plasma waves at Saturn

Journal article

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Short periodicities in low-frequency plasma waves at Saturn

J. F. Carbary, W. S. Kurth and D. G. Mitchell

Journal of geophysical research. Space physics, Vol.121(7), pp.6562-6572

07/01/2016

DOI: 10.1002/2016JA022732

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Abstract

Short-period amplitude modulations (similar to 60min period) have been detected in the similar to 100Hz plasma wave emissions observed by the Radio Plasma Wave Science instrument on the Cassini spacecraft in orbit around Saturn. These periodicities were detected throughout the mission from mid-2004 to the present, and this is the first statistical study of them. The modulations are observed throughout the magnetosphere and can last from similar to 2h to similar to 20h, although the duration may be biased by spacecraft observing conditions. The periodicities are statistically much more likely to be seen at high latitudes, both north and south, and at local times between dusk and midnight. When corrected for latitude and local time, the occurrence frequency has declined in time since 2005. Considering all observations, the mean period of these events is 65.320.7min, with a peak (modal value) at 63.3min. The period has no dependence on local time or latitude. Alfven waves have interhemispheric transit times commensurate with the mean periods and should thus be considered principal candidates for their production.

Astronomy & Astrophysics

Physical Sciences

Science & Technology

Details

Title: Subtitle: Short periodicities in low-frequency plasma waves at Saturn
Creators: J. F. Carbary - Johns Hopkins University Applied Physics Laboratory
W. S. Kurth - University of Iowa
D. G. Mitchell - Johns Hopkins University Applied Physics Laboratory
Resource Type: Journal article
Publication Details: Journal of geophysical research. Space physics, Vol.121(7), pp.6562-6572
DOI: 10.1002/2016JA022732
ISSN: 2169-9380
eISSN: 2169-9402
Publisher: Amer Geophysical Union
Number of pages: 11
Grant note: 003; NAS5-97271 / NASA Office of Space Science; National Aeronautics & Space Administration (NASA) NASA Goddard Space Flight Center; National Aeronautics & Space Administration (NASA) Johns Hopkins University 1415150 / NASA; National Aeronautics & Space Administration (NASA) Jet Propulsion Laboratory; National Aeronautics & Space Administration (NASA)
Language: English
Date published: 07/01/2016
Academic Unit: Physics and Astronomy
Record Identifier: 9984455263802771

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