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Generation of extremely low frequency chorus in Van Allen radiation belts: ELF CHORUS GENERATION

Journal Article · · Journal of Geophysical Research. Space Physics
DOI:https://doi.org/10.1002/2016JA023561· OSTI ID:1345929
 [1];  [1];  [2];  [2];  [1];  [1];  [3];  [1];  [2];  [4];  [5];  [6];  [7];  [8]
  1. School of Physics and Electronic Sciences, Changsha University of Science and Technology, Changsha China
  2. Chinese Academy of Sciences Key Laboratory for Basic Plasma Physics, University of Science and Technology of China, Hefei China
  3. Shenzhen Graduate School, Harbin Institute of Technology, Shenzhen China
  4. Laboratory for Atmospheric and Space Physics, University of Colorado Boulder, Boulder Colorado USA
  5. Institute for the Study of Earth, Oceans, and Space, University of New Hampshire, Durham New Hampshire USA
  6. Space Science and Applications Group, Los Alamos National Laboratory, Los Alamos New Mexico USA
  7. ISR Division, Los Alamos National Laboratory, Los Alamos New Mexico USA
  8. Aerospace Corporation, Los Angeles California USA
+ Show Author Affiliations

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 fce, was generated by energetic electrons originating from Earth's plasmasheet. Chorus below 0.1 fce 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 fce. 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.

Research Organization:
Los Alamos National Laboratory (LANL)
Sponsoring Organization:
USDOE; National Aeronautic and Space Administration (NASA)
Grant/Contract Number:
AC52-06NA25396
OSTI ID:
1345929
Report Number(s):
LA-UR-15-28806
Journal Information:
Journal of Geophysical Research. Space Physics, Journal Name: Journal of Geophysical Research. Space Physics Journal Issue: 3 Vol. 122; ISSN 2169-9380
Publisher:
American Geophysical UnionCopyright Statement
Country of Publication:
United States
Language:
English

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Cited By (4)

Analytical Chorus Wave Model Derived from Van Allen Probe Observations journal February 2019
Outer Van Allen Radiation Belt Response to Interacting Interplanetary Coronal Mass Ejections journal March 2019
Van Allen Probes Observations of Chorus Wave Vector Orientations: Implications for the Chorus‐to‐Hiss Mechanism journal March 2019
Low-frequency hiss-like whistler-mode waves generated by nonlinear three-wave interactions outside the plasmasphere journal December 2019

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Related Subjects

79 ASTRONOMY AND ASTROPHYSICS
Heliospheric and Magnetospheric Physics