Actions for Solar wind conditions leading to efficient radiation belt electron acceleration [electronic resource] : A superposed epoch analysis

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Solar wind conditions leading to efficient radiation belt electron acceleration [electronic resource] : A superposed epoch analysis

Published
Washington, D.C. : United States. Dept. of Energy, 2015.
Oak Ridge, Tenn. : Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy
Physical Description
pages 6,906-6,915 : digital, PDF file
Additional Creators
Los Alamos National Laboratory, United States. Department of Energy, and United States. Department of Energy. Office of Scientific and Technical Information
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Summary
In this study by determining preferential solar wind conditions leading to efficient radiation belt electron acceleration is crucial for predicting radiation belt electron dynamics. Using Van Allen Probes electron observations (>1 MeV) from 2012 to 2015, we identify a number of efficient and inefficient acceleration events separately to perform a superposed epoch analysis of the corresponding solar wind parameters and geomagnetic indices. By directly comparing efficient and inefficient acceleration events, we clearly show that prolonged southward Bz, high solar wind speed, and low dynamic pressure are critical for electron acceleration to >1 MeV energies in the heart of the outer radiation belt. We also evaluate chorus wave evolution using the superposed epoch analysis for the identified efficient and inefficient acceleration events and find that chorus wave intensity is much stronger and lasts longer during efficient electron acceleration events, supporting the scenario that chorus waves play a key role in MeV electron acceleration.
Report Numbers
E 1.99:la-ur--15-27787
la-ur--15-27787
Subject(s)
Note
Published through SciTech Connect.
09/07/2015.
"la-ur--15-27787"
Geophysical Research Letters 42 17 ISSN 0094-8276 AM
W. Li; R. M. Thorne; J. Bortnik; D. N. Baker; G. D. Reeves; S. G. Kanekal; H. E. Spence; J. C. Green.
Funding Information
NNX11AD75G
NNX14AN85G
NNX11AR64G
NNX13AI61G
AC52-06NA25396
View MARC record | catkey: 23782522