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On the parameter dependence of the whistler anisotropy instability

Journal Article · · Journal of Geophysical Research. Space Physics
DOI:https://doi.org/10.1002/2017JA023895· OSTI ID:1466261
 [1];  [2];  [3];  [3];  [4];  [3]
  1. Univ. of California, Los Angeles, CA (United States); 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)
  4. Univ. of California, Los Angeles, CA (United States); Boston Univ., Boston, MA (United States)
+ Show Author Affiliations

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.

Research Organization:
Univ. of California, Los Angeles, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC)
Grant/Contract Number:
SC0010578
OSTI ID:
1466261
Alternate ID(s):
OSTI ID: 1402343
Journal Information:
Journal of Geophysical Research. Space Physics, Journal Name: Journal of Geophysical Research. Space Physics Journal Issue: 2 Vol. 122; ISSN 2169-9380
Publisher:
American Geophysical UnionCopyright Statement
Country of Publication:
United States
Language:
English

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Cited By (7)

Quasilinear analysis of saturation properties of broadband whistler mode waves: BROADBAND WHISTLER MODE WAVES journal August 2017
The Relationship Between EMIC Wave Properties and Proton Distributions Based on Van Allen Probes Observations journal April 2019
Energy Transport by Whistler Waves Around Dipolarizing Flux Bundles journal November 2019
The Effects of Thermal Electrons on Whistler Mode Waves Excited by Anisotropic Hot Electrons: Linear Theory and 2‐D PIC Simulations journal July 2019
Saturation Properties of Whistler Wave Instability in a Plasma With Two Electron Components journal July 2019
Periodic Excitation of Chorus and ECH Waves Modulated by Ultralow Frequency Compressions journal November 2019
Origin of two-band chorus in the radiation belt of Earth journal October 2019

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Related Subjects

79 ASTRONOMY AND ASTROPHYSICS
Whistler anisotropy instability
Whistler‐mode chorus waves
electron anisotropy
electron beta