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Title: Electron nonlinear resonant interaction with short and intense parallel chorus wave-packets
Authors: Mourenas, D.
Zhang, X-J.
Artemyev, A.V.
Angelopoulos, V.
Thorne, R.M.
Bortnik, J.
Neishtadt, Anatoly
Vasiliev, Alexei
Keywords: Nonlinear interaction
Short wave‐packets
Chorus waves
Radiation belts
Kinetic equation
Issue Date: 2018
Publisher: © American Geophysical Union
Citation: MOURENAS, D. ... et al, 2018. Electron nonlinear resonant interaction with short and intense parallel chorus wave-packets. Journal of Geophysical Research, 123(6), pp. 4979-4999.
Abstract: One of the major drivers of radiation belt dynamics, electron resonant interaction with whistler‐mode chorus waves, is traditionally described using the quasi‐linear diffusion approximation. Such a description satisfactorily explains many observed phenomena, but its applicability can be justified only for sufficiently low intensity, long duration waves. Recent spacecraft observations of a large number of very intense lower band chorus waves (with magnetic field amplitudes sometimes reaching ∼1% of the background) therefore challenge this traditional description, and call for an alternative approach when addressing the global, long‐term effects of the nonlinear interaction of these waves with radiation belt electrons. In this paper, we first use observations from the Van Allen Probes and Time History of Events and Macroscale Interactions during Substorms (THEMIS) spacecraft to show that the majority of intense parallel chorus waves consists of relatively short wave‐packets. Then, we construct a kinetic equation describing the nonlinear resonant interaction of radiation belt electrons with such short and intense wave‐packets. We demonstrate that this peculiar type of nonlinear interaction produces similar effects as quasi‐linear diffusion, i.e., a flattening of the electron velocity distribution function within a certain energy/pitch‐angle range. The main difference is the much faster evolution of the electron distribution when nonlinear interaction prevails.
Description: This paper is closed access until 21 November 2018.
Sponsor: X.J.Z. and A.V.A. acknowledge NASA contract NAS5-02099 for use of data from the THEMIS Mission, specifically J. W. Bonnell and F. S. Mozer for use of EFI data, A. Roux and O. LeContel for use of SCM data, and K. H. Glassmeier, U. Auster and W. Baumjohann for the use of FGM data provided under the lead of the Technical University of Braunschweig and with financial support through the German Ministry for Economy and Technology and the German Center for Aviation and Space (DLR) under contract 50 OC 0302. The work of X.J.Z. was also supported by RBSP-EMFISIS and RBSP-ECT funding 443956-TH-81074 and 443956-TH-79425 under NASA’s prime contract No. NNN06AA01C. We acknowledge the Van Allen Probes EMFISIS data obtained from https://emfisis.physics.uiowa.edu/data/index, and THEMIS data from http://themis.ssl.berkeley.edu/. We also thank the World Data Center for Geomagnetism, Kyoto for providing AE index, and the Space Physics Data Facility at the NASA Goddard Space Flight Center for providing the OMNI data used in this study.
Version: Accepted for publication
DOI: 10.1029/2018JA025417
URI: https://dspace.lboro.ac.uk/2134/33306
Publisher Link: https://doi.org/10.1029/2018JA025417
ISSN: 0148-0227
Appears in Collections:Closed Access (Maths)

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