Generation of extremely low frequency chorus in Van Allen radiation belts [electronic resource] : ELF CHORUS GENERATION
- Washington, D.C. : United States. Dept. of Energy, 2017.
Oak Ridge, Tenn. : Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy
- Physical Description:
- pages 3,201-3,211 : digital, PDF file
- Additional Creators:
- Los Alamos National Laboratory
United States. Department of Energy
National Aeronautics and Space Administration Announcement
United States. Department of Energy. Office of Scientific and Technical Information
- Recent studies have shown that chorus can efficiently accelerate the outer radiation belt electrons to relativistic energies. Chorus, previously often observed above 0.1 equatorial electron gyrofrequency f<sub>ce</sub>, was generated by energetic electrons originating from Earth's plasmasheet. Chorus below 0.1 f<sub>ce</sub> has seldom been reported until the recent data from Van Allen Probes but its origin has not been revealed so far. Because electron resonant energy can approach the relativistic level at extremely low frequency relativistic effects should be considered in the formula for whistler-mode wave growth rate. Here we report high-resolution observations during the 14 October 2014 small storm and firstly demonstrate, using a fully relativistic simulation, that electrons with the high energy tail population and relativistic pitch angle anisotropy can provide free energy sufficient for generating chorus below 0.1 f<sub>ce</sub>. The simulated wave growth displays a very similar pattern to the observations. Finally, the current results can be applied to Jupiter, Saturn and other magnetized planets.
- Published through SciTech Connect.
Journal of Geophysical Research. Space Physics 122 3 ISSN 2169-9380 AM
Xiao, Fuliang; Liu, Si; Tao, Xin; Su, Zhenpeng; Zhou, Qinghua; Yang, Chang; He, Zhaoguo; He, Yihua; Gao, Zhonglei; Baker, D.; Spence, H.; Reeves, G.; Funsten, H.; Blake, J.
- Funding Information:
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