The Storm Time Development of Source Electrons and Chorus Wave Activity During CME- and CIR-Driven Storms

S. T. Bingham; C. G. Mouikis; L. M. Kistler; K. W. Paulson; C. J. Farrugia; C. L. Huang; H. E. Spencer; G. D. Reeves; C. Kletzing

doi:10.1029/2019JA026689

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The Storm Time Development of Source Electrons and Chorus Wave Activity During CME- and CIR-Driven Storms

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The Storm Time Development of Source Electrons and Chorus Wave Activity During CME- and CIR-Driven Storms

S. T. Bingham, C. G. Mouikis, L. M. Kistler, K. W. Paulson, C. J. Farrugia, C. L. Huang, H. E. Spencer, G. D. Reeves and C. Kletzing

Journal of geophysical research. Space physics, Vol.124(8), pp.6438-6452

08/01/2019

DOI: 10.1029/2019JA026689

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Abstract

Whistler mode chorus waves influence the dynamics of the Earth's radiation belts and the inner magnetosphere through gyroresonant wave particle interactions. Chorus waves are generated by anisotropic hot electrons from a few to tens of keV, called source electrons, which have increased access from the nightside plasma sheet to the inner magnetosphere during geomagnetic storms. The primary drivers of geomagnetic storms are coronal mass ejections (CMEs) and corotating interaction regions (CIRs). Through differences in their characteristic physical parameters, they can each impact the nightside plasma sheet differently. Using Van Allen Probes observations, we have conducted a superposed epoch analysis of chorus wave activity and source electron development across all local times between L = 2-6 during 25 CME- and 35 CIR-driven storms. The superposed epoch analysis shows that chorus wave power follows the storm phase-dependent access of the source electron population. Chorus waves and source electrons are observed on the dawnside during the main phase, when open drift path access via eastward convective drift from the plasma sheet is enhanced. During the recovery phase, chorus waves and source electrons are observed at all magnetic local times with low intensities, exemplifying the formation of a weak symmetric, trapped electron population. A linear theory approximation for wave growth from source electron observations shows that increased wave growth follows the enhanced source electrons during each storm phase. CME and CIR storms display similar behavior and levels of average wave power; however, chorus wave activity reaches lower L-shells during CME storms on average.

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Title: Subtitle: The Storm Time Development of Source Electrons and Chorus Wave Activity During CME- and CIR-Driven Storms
Creators: S. T. Bingham - Johns Hopkins University Applied Physics Laboratory
C. G. Mouikis - University of New Hampshire
L. M. Kistler - University of New Hampshire at Manchester
K. W. Paulson - University of New Hampshire
C. J. Farrugia - University of New Hampshire
C. L. Huang - Univ New Hampshire, Inst Study Earth Oceans & Space, Durham, NH 03824 USA
H. E. Spencer - Univ New Hampshire, Inst Study Earth Oceans & Space, Durham, NH 03824 USA
G. D. Reeves - Los Alamos National Laboratory
C. Kletzing - University of Iowa
Resource Type: Journal article
Publication Details: Journal of geophysical research. Space physics, Vol.124(8), pp.6438-6452
DOI: 10.1029/2019JA026689
ISSN: 2169-9380
eISSN: 2169-9402
Publisher: Amer Geophysical Union
Number of pages: 15
Grant note: NNX16AO04G; NNN06AA01C; NNX14AC88G / NASA; National Aeronautics & Space Administration (NASA) NNX15AH79H / New Hampshire Space Grant Consortium under NASA
Language: English
Date published: 08/01/2019
Academic Unit: Physics and Astronomy
Record Identifier: 9984429040402771

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