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Title: On the parameter dependence of the whistler anisotropy instability

Abstract

The evolution of the whistler anisotropy instability relevant to whistler-mode chorus waves in the Earth’s inner magnetosphere is studied using kinetic simulations and is compared with satellite observations. The electron distribution is constrained by the whistler anisotropy instability to a marginal stability state and presents an upper bound of electron anisotropy, which agrees with satellite observations. The electron beta β ∥e separates whistler waves into two groups: (i) quasi-parallel whistler waves for β ∥e ≳ 0.02 and (ii) oblique whistler waves close to the resonance cone for β ∥e ≲ 0.02. Landau damping is important in the saturation and relaxation stage of the oblique whistler wave growth. The saturated magnetic field energy of whistler waves roughly scales with the electron beta β 2 ∥e, shown in both simulations and satellite observations. Lastly, these results suggest the critical role of electron beta β ∥e in determining the whistler wave properties in the inner magnetosphere.

Authors:
ORCiD logo [1]; ORCiD logo [2]; ORCiD logo [1];  [1]; ORCiD logo [3]; ORCiD logo [1]
  1. Univ. of California, Los Angeles, CA (United States)
  2. Univ. of California, Los Angeles, CA (United States); Univ. Corp. for Atmospheric Research, Boulder, CO (United States)
  3. Univ. of California, Los Angeles, CA (United States); Boston Univ., Boston, MA (United States)
Publication Date:
Research Org.:
Univ. of California, Los Angeles, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
1466261
Alternate Identifier(s):
OSTI ID: 1402343
Grant/Contract Number:  
SC0010578
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Journal of Geophysical Research. Space Physics
Additional Journal Information:
Journal Volume: 122; Journal Issue: 2; Journal ID: ISSN 2169-9380
Publisher:
American Geophysical Union
Country of Publication:
United States
Language:
English
Subject:
79 ASTRONOMY AND ASTROPHYSICS; Whistler anisotropy instability; Whistler‐mode chorus waves; electron anisotropy; electron beta

Citation Formats

An, Xin, Yue, Chao, Bortnik, Jacob, Decyk, Viktor, Li, Wen, and Thorne, Richard M. On the parameter dependence of the whistler anisotropy instability. United States: N. p., 2017. Web. doi:10.1002/2017JA023895.
An, Xin, Yue, Chao, Bortnik, Jacob, Decyk, Viktor, Li, Wen, & Thorne, Richard M. On the parameter dependence of the whistler anisotropy instability. United States. doi:10.1002/2017JA023895.
An, Xin, Yue, Chao, Bortnik, Jacob, Decyk, Viktor, Li, Wen, and Thorne, Richard M. Sat . "On the parameter dependence of the whistler anisotropy instability". United States. doi:10.1002/2017JA023895. https://www.osti.gov/servlets/purl/1466261.
@article{osti_1466261,
title = {On the parameter dependence of the whistler anisotropy instability},
author = {An, Xin and Yue, Chao and Bortnik, Jacob and Decyk, Viktor and Li, Wen and Thorne, Richard M.},
abstractNote = {The evolution of the whistler anisotropy instability relevant to whistler-mode chorus waves in the Earth’s inner magnetosphere is studied using kinetic simulations and is compared with satellite observations. The electron distribution is constrained by the whistler anisotropy instability to a marginal stability state and presents an upper bound of electron anisotropy, which agrees with satellite observations. The electron beta β∥e separates whistler waves into two groups: (i) quasi-parallel whistler waves for β∥e ≳ 0.02 and (ii) oblique whistler waves close to the resonance cone for β∥e ≲ 0.02. Landau damping is important in the saturation and relaxation stage of the oblique whistler wave growth. The saturated magnetic field energy of whistler waves roughly scales with the electron beta β2∥e, shown in both simulations and satellite observations. Lastly, these results suggest the critical role of electron beta β∥e in determining the whistler wave properties in the inner magnetosphere.},
doi = {10.1002/2017JA023895},
journal = {Journal of Geophysical Research. Space Physics},
number = 2,
volume = 122,
place = {United States},
year = {Sat Feb 18 00:00:00 EST 2017},
month = {Sat Feb 18 00:00:00 EST 2017}
}

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Cited by: 6 works
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