Journal article
Survey of whistler mode chorus intensity at Jupiter
Journal of geophysical research. Space physics, Vol.121(10), pp.9758-9770
10/01/2016
DOI: 10.1002/2016JA022969
Abstract
Whistler mode chorus emission is important in the acceleration of electrons and filling of the radiation belts at Jupiter. In this work chorus magnetic intensity levels (frequency-integrated spectral density, P-B) at Jupiter are comprehensively binned and parameterized. The frequency range of chorus under study extends from the lower hybrid frequency, f(lh), to f(ceq)/2 and f(ceq)/2< f< 0.8 f(ceq), where f(ceq) is the cyclotron frequency mapped to the magnetic equator. The goal is to obtain a quantized distribution of magnetic intensity for use in stochastic modeling efforts. Parametric fits of magnetic plasma wave intensity are obtained, including PB versus frequency, latitude, and L shell. The results indicate that Jupiter chorus occurrence probability and intensity are higher than those at Saturn, reaching values observed at Earth. Jovian chorus is observed over most local times, confined primarily to the range 8< L< 15, outside the high densities of the Io torus. The largest intensity levels are seen on the dayside; however, the sampling of chorus on the nightside is much less than on the dayside. Peak intensities occur near the equator with a weak dependence on magnetic latitude, lambda. We conclude that Jovian chorus average intensity levels are approximately an order of magnitude lower than those at Earth. In more isolated regions the intensities are comparable to those observed at Earth. The spatial range of the chorus emissions extends beyond that assumed in previous Jovian global diffusive models of wave-particle electron acceleration.
Details
- Title: Subtitle
- Survey of whistler mode chorus intensity at Jupiter
- Creators
- J. D. Menietti - University of IowaJ. B. Groene - University of IowaT. F. Averkamp - University of IowaR. B. Horne - British Antarctic SurveyE. E. Woodfield - British Antarctic SurveyY. Y. Shprits - University of California, Los AngelesM. de Soria-Santacruz Pich - California Institute of TechnologyD. A. Gurnett - University of Iowa
- Resource Type
- Journal article
- Publication Details
- Journal of geophysical research. Space physics, Vol.121(10), pp.9758-9770
- Publisher
- Amer Geophysical Union
- DOI
- 10.1002/2016JA022969
- ISSN
- 2169-9380
- eISSN
- 2169-9402
- Number of pages
- 13
- Grant note
- ST/M00130X/1 / STFC grant; UK Research & Innovation (UKRI); Science & Technology Facilities Council (STFC) bas0100031 / Natural Environment Research Council; UK Research & Innovation (UKRI); Natural Environment Research Council (NERC) NNX11AM36G / NASA grant; National Aeronautics & Space Administration (NASA) ST/M00130X/1 / STFC; UK Research & Innovation (UKRI); Science & Technology Facilities Council (STFC) UK Natural Environment Research Council; UK Research & Innovation (UKRI); Natural Environment Research Council (NERC) 1415150 / JPL National Aeronautics and Space Administration; National Aeronautics & Space Administration (NASA) bas0100031 / NERC; UK Research & Innovation (UKRI); Natural Environment Research Council (NERC) ST/M00130X/1 / Science and Technology Facilities Council; UK Research & Innovation (UKRI); Science & Technology Facilities Council (STFC)
- Language
- English
- Date published
- 10/01/2016
- Academic Unit
- Physics and Astronomy
- Record Identifier
- 9984627202002771
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