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Title: The relationship between the macroscopic state of electrons and the properties of chorus waves observed by the Van Allen Probes

Abstract

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.

Authors:
 [1];  [2];  [2];  [2];  [2];  [2];  [3];  [4];  [4];  [5]
+ Show Author Affiliations
  1. Univ. of California, Los Angeles, CA (United States); Univ. Corp. for Atmospheric Research, Boulder, CO (United States)
  2. Univ. of California, Los Angeles, CA (United States)
  3. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  4. Johns Hopkins Univ. Applied Physics Lab., Laurel, MD (United States)
  5. Univ. of Iowa, Iowa City, IA (United States)
Publication Date:
Research Org.:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org.:
National Aeronautics and Space Administration (NASA); USDOE
OSTI Identifier:
1345935
Report Number(s):
LA-UR-16-26171
Journal ID: ISSN 0094-8276
Grant/Contract Number:  
AC52-06NA25396
Resource Type:
Accepted Manuscript
Journal Name:
Geophysical Research Letters
Additional Journal Information:
Journal Volume: 43; Journal Issue: 15; Journal ID: ISSN 0094-8276
Publisher:
American Geophysical Union
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; Heliospheric and Magnetospheric Physics

Citation Formats

Yue, Chao, An, Xin, Bortnik, Jacob, Ma, Qianli, Li, Wen, Thorne, Richard M., Reeves, Geoffrey D., Gkioulidou, Matina, Mitchell, Donald G., and Kletzing, Craig A. The relationship between the macroscopic state of electrons and the properties of chorus waves observed by the Van Allen Probes. United States: N. p., 2016. Web. doi:10.1002/2016GL070084.
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Yue, Chao, An, Xin, Bortnik, Jacob, Ma, Qianli, Li, Wen, Thorne, Richard M., Reeves, Geoffrey D., Gkioulidou, Matina, Mitchell, Donald G., & Kletzing, Craig A. The relationship between the macroscopic state of electrons and the properties of chorus waves observed by the Van Allen Probes. United States. https://doi.org/10.1002/2016GL070084
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Yue, Chao, An, Xin, Bortnik, Jacob, Ma, Qianli, Li, Wen, Thorne, Richard M., Reeves, Geoffrey D., Gkioulidou, Matina, Mitchell, Donald G., and Kletzing, Craig A. Thu . "The relationship between the macroscopic state of electrons and the properties of chorus waves observed by the Van Allen Probes". United States. https://doi.org/10.1002/2016GL070084. https://www.osti.gov/servlets/purl/1345935.
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@article{osti_1345935,
title = {The relationship between the macroscopic state of electrons and the properties of chorus waves observed by the Van Allen Probes},
author = {Yue, Chao and An, Xin and Bortnik, Jacob and Ma, Qianli and Li, Wen and Thorne, Richard M. and Reeves, Geoffrey D. and Gkioulidou, Matina and Mitchell, Donald G. and Kletzing, Craig A.},
abstractNote = {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.},
doi = {10.1002/2016GL070084},
journal = {Geophysical Research Letters},
number = 15,
volume = 43,
place = {United States},
year = {Thu Aug 04 00:00:00 EDT 2016},
month = {Thu Aug 04 00:00:00 EDT 2016}
}
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https://doi.org/10.1002/2016GL070084
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    Works referencing / citing this record:

    Properties of Intense Field-Aligned Lower-Band Chorus Waves: Implications for Nonlinear Wave-Particle Interactions: INTENSE FIELD-ALIGNED CHORUS WAVE-PACKETS
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    The Relationship Between EMIC Wave Properties and Proton Distributions Based on Van Allen Probes Observations
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    • Yue, Chao; Jun, Chae‐Woo; Bortnik, Jacob
    • Geophysical Research Letters, Vol. 46, Issue 8
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