Nonlinear Electron Interaction With Intense Chorus Waves: Statistics of Occurrence Rates

X. -J. Zhang; D. Mourenas; A. V. Artemyev; V. Angelopoulos; J. Bortnik; R. M. Thorne; W. S. Kurth; C. A. Kletzing; G. B. Hospodarsky

doi:10.1029/2019GL083833

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Nonlinear Electron Interaction With Intense Chorus Waves: Statistics of Occurrence Rates

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Nonlinear Electron Interaction With Intense Chorus Waves: Statistics of Occurrence Rates

X. -J. Zhang, D. Mourenas, A. V. Artemyev, V. Angelopoulos, J. Bortnik, R. M. Thorne, W. S. Kurth, C. A. Kletzing and G. B. Hospodarsky

Geophysical research letters, Vol.46(13), pp.7182-7190

07/16/2019

DOI: 10.1029/2019GL083833

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Abstract

A comprehensive statistical analysis on 8 years of lower-band chorus wave packets measured by the Van Allen Probes and THEMIS spacecraft is performed to examine whether, when, and where these waves are above the theoretical threshold for nonlinear resonant wave-particle interaction. We find that similar to 5-30% of all chorus waves interact nonlinearly with similar to 30-to 300-keV electrons possessing equatorial pitch angles of > 40 degrees in the outer radiation belt, especially during disturbed (AE > 500 nT) periods with energetic particles associated with injections from the plasma sheet. Such considerable occurrence rates of nonlinear interactions imply that the evolution of energetic electron fluxes should be dominated by nonlinear effects, rather than by quasi-linear diffusion as commonly assumed. We discuss the possible consequences of such a large amount of high-amplitude chorus waves and examine their characteristics that can influence the efficiency of nonlinear wave-particle interactions.

Geology

Physical Sciences

Geosciences, Multidisciplinary

Science & Technology

Details

Title: Subtitle: Nonlinear Electron Interaction With Intense Chorus Waves: Statistics of Occurrence Rates
Creators: X. -J. Zhang - Univ Calif Los Angeles, Dept Earth Planetary & Space Sci, Los Angeles, CA 90095 USA
D. Mourenas - CEA DAM Île-de-France
A. V. Artemyev - University of California, Los Angeles
V. Angelopoulos - Planetary Science Institute
J. Bortnik - University of California, Los Angeles
R. M. Thorne - University of California, Los Angeles
W. S. Kurth - University of Iowa
C. A. Kletzing - University of Iowa
G. B. Hospodarsky - University of Iowa
Resource Type: Journal article
Publication Details: Geophysical research letters, Vol.46(13), pp.7182-7190
DOI: 10.1029/2019GL083833
ISSN: 0094-8276
eISSN: 1944-8007
Publisher: Amer Geophysical Union
Number of pages: 9
Grant note: 921647; NAS5-01072 / JHU/APL under NASA RBSP-EMFISIS 443956-TH-81074; 443956-TH-79425; NNN06AA01C / RBSP-ECT under NASA NAS5-02099 / NASA; National Aeronautics & Space Administration (NASA) German Ministry for Economy and Technology 50 OC 0302 / German Center for Aviation and Space (DLR); Helmholtz Association; German Aerospace Centre (DLR)
Language: English
Date published: 07/16/2019
Academic Unit: Physics and Astronomy
Record Identifier: 9984429037802771

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