Journal article
Survey analysis of chorus intensity at Saturn
Journal of geophysical research. Space physics, Vol.119(10), pp.8415-8425
10/2014
DOI: 10.1002/2014JA020523
Abstract
In order to conduct theoretical studies or modeling of pitch angle scattering of electrons by whistler mode chorus emission at Saturn, a knowledge of chorus occurrence and magnetic intensity levels, P-B, as well as the distribution of P-B relative to frequency and spatial parameters is essential. In this paper an extensive survey of whistler mode magnetic intensity levels at Saturn is carried out, and Gaussian fits of P-B are performed. We fit the spectrum of wave magnetic intensity between the lower hybrid frequency and f(ceq)/2 and for frequencies in the interval f(ceq)/2<f<0.9 f(ceq), where f(ceq) is the cyclotron frequency mapped to the equator. Saturn chorus is observed over most local times, but is dominant on the nightside in the range of 4.5<L<7.5, with minimum power at the equator and peak power in the range of 5 degrees<<10 degrees. Saturn wave magnetic intensity averaged in frequency bins peaks in the range of 10(-5)<P-B<10(-4)nT(2) for 0.4<<0.5 (=f/f(ceq)). Gaussian fits of P-B with frequency and latitude are obtained for lower band chorus. Plasma injection regions are occasionally encountered with significant chorus power levels. Upper band chorus is seen almost exclusively within plasma injection regions, and the number of events is very limited, but when present, the average levels of P-B can be higher than the lower band chorus. The overall magnetic intensity contribution of the upper band, however, is insignificant relative to the lower band.
Details
- Title: Subtitle
- Survey analysis of chorus intensity at Saturn
- Creators
- J. D. Menietti - University of IowaT. F. Averkamp - University of IowaJ. B. Groene - University of IowaR. B. Horne - British Antarctic SurveyY. Y. Shprits - University of California, Los AngelesE. E. Woodfield - British Antarctic SurveyG. B. Hospodarsky - University of IowaD. A. Gurnett - University of Iowa
- Resource Type
- Journal article
- Publication Details
- Journal of geophysical research. Space physics, Vol.119(10), pp.8415-8425
- DOI
- 10.1002/2014JA020523
- ISSN
- 2169-9380
- eISSN
- 2169-9402
- Publisher
- Amer Geophysical Union
- Number of pages
- 11
- Grant note
- bas0100023 / NERC; UK Research & Innovation (UKRI); Natural Environment Research Council (NERC) NERC; UK Research & Innovation (UKRI); Natural Environment Research Council (NERC) ST/I001727/1 / Science and Technology Facilities Council; UK Research & Innovation (UKRI); Science & Technology Facilities Council (STFC) 1415150 / JPL bas0100023 / Natural Environment Research Council; UK Research & Innovation (UKRI); Natural Environment Research Council (NERC) ST/I001727/1 / STFC; UK Research & Innovation (UKRI); Science & Technology Facilities Council (STFC) NNX11AM36G / NASA; National Aeronautics & Space Administration (NASA) ST/1001727/1 / STFC; UK Research & Innovation (UKRI); Science & Technology Facilities Council (STFC)
- Language
- English
- Date published
- 10/2014
- Academic Unit
- Physics and Astronomy
- Record Identifier
- 9984455659202771
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