Journal
GEOPHYSICAL RESEARCH LETTERS
Volume 42, Issue 17, Pages 6906-6915Publisher
AMER GEOPHYSICAL UNION
DOI: 10.1002/2015GL065342
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Funding
- JHU/APL under NASA [967399, 921647, NAS5-01072]
- ECT [13-041]
- NASA [NNX11AD75G, NNX14AN85G, NNX11AR64G, NNX13AI61G]
- Air Force Young Investigator program [FA9550-15-1-0158]
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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 B-z, 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.
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