On the parameter dependence of the whistler anisotropy instability

An, Xin; Yue, Chao; Bortnik, Jacob; Decyk, Viktor; Li, Wen; Thorne, Richard M.

doi:10.1002/2017JA023895

Title: On the parameter dependence of the whistler anisotropy instability

Journal Article · 18 February 2017 · Journal of Geophysical Research. Space Physics

DOI: https://doi.org/10.1002/2017JA023895 · OSTI ID:1466261

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Univ. of California, Los Angeles, CA (United States)
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); Boston Univ., Boston, MA (United States)

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 and (ii) oblique whistler waves close to the resonance cone for . 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 , shown in both simulations and satellite observations. These results suggest the critical role of electron beta β _{∥ e} in determining the whistler wave properties in the inner magnetosphere.

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Research Organization:: Univ. of California, Los Angeles, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC); USDOE

Grant/Contract Number:: SC0010578

OSTI ID:: 1466261

Alternate ID(s):: OSTI ID: 1402343

Journal Information:: Journal of Geophysical Research. Space Physics, Vol. 122, Issue 2; ISSN 2169-9380

Publisher:: American Geophysical UnionCopyright Statement

Country of Publication:: United States

Language:: English

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The Effects of Thermal Electrons on Whistler Mode Waves Excited by Anisotropic Hot Electrons: Linear Theory and 2‐D PIC Simulations Fan, Kai; Gao, Xinliang; Lu, Quanming Journal of Geophysical Research: Space Physics, Vol. 124, Issue 7 https://doi.org/10.1029/2019ja026463	journal	July 2019
Saturation Properties of Whistler Wave Instability in a Plasma With Two Electron Components Wu, Yifan; Tao, Xin; Lu, Quanming Journal of Geophysical Research: Space Physics, Vol. 124, Issue 7 https://doi.org/10.1029/2019ja026752	journal	July 2019
Periodic Excitation of Chorus and ECH Waves Modulated by Ultralow Frequency Compressions Zhang, Xiao‐Jia; Chen, Lunjin; Artemyev, Anton V. Journal of Geophysical Research: Space Physics, Vol. 124, Issue 11 https://doi.org/10.1029/2019ja027201	journal	November 2019
Origin of two-band chorus in the radiation belt of Earth Li, Jinxing; Bortnik, Jacob; An, Xin Nature Communications, Vol. 10, Issue 1 https://doi.org/10.1038/s41467-019-12561-3	journal	October 2019

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

Title: On the parameter dependence of the whistler anisotropy instability

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