The relationship between the macroscopic state of electrons and the properties of chorus waves observed by the Van Allen Probes
- Univ. of California, Los Angeles, CA (United States); Univ. Corp. for Atmospheric Research, Boulder, CO (United States)
- Univ. of California, Los Angeles, CA (United States)
- Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
- Johns Hopkins Univ. Applied Physics Lab., Laurel, MD (United States)
- Univ. of Iowa, Iowa City, IA (United States)
Plasma kinetic theory predicts that a sufficiently anisotropic electron distribution will excite whistler mode waves, which in turn relax the electron distribution in such a way as to create an upper bound on the relaxed electron anisotropy. Here using whistler mode chorus wave and plasma measurements by Van Allen Probes, we confirm that the electron distributions are well constrained by this instability to a marginally stable state in the whistler mode chorus waves generation region. Lower band chorus waves are organized by the electron β∥e into two distinct groups: (i) relatively large-amplitude, quasi-parallel waves with β∥e ≳0:025 and (ii) relatively small-amplitude, oblique waves with β∥e ≲0:025. The upper band chorus waves also have enhanced amplitudes close to the instability threshold, with large-amplitude waves being quasi-parallel whereas small-amplitude waves being oblique. These results provide important insight for studying the excitation of whistler mode chorus waves.
- Research Organization:
- Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
- Sponsoring Organization:
- National Aeronautics and Space Administration (NASA); USDOE
- Grant/Contract Number:
- AC52-06NA25396
- OSTI ID:
- 1345935
- Report Number(s):
- LA-UR-16-26171
- Journal Information:
- Geophysical Research Letters, Vol. 43, Issue 15; ISSN 0094-8276
- Publisher:
- American Geophysical UnionCopyright Statement
- Country of Publication:
- United States
- Language:
- English
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