The Characteristics of Three-belt Structure of Sub-MeV Electrons in the Radiation Belts

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Abstract
Abstract After the launch of Van Allen Probes, the three-belt structures of ultra-relativistic electrons are discovered. In this study, we investigate the three-belt structures of sub-MeV electrons, which may form under different mechanism compared with those of ultra-relativistic electrons and are worth in-depth analysis. Based on the differential flux data from MagEIS onboard RBSP-B satellite, we find 54 events, in which two comparable peaks of sub-MeV electron fluxes and a slot appear where there should be the outer radiation belt. Through the statistical analysis, the three-belt structures of sub-MeV electrons are found to be closely related to SYM-H and AE indices. The 2-day SYM-H minimum and AE maximum before the event have a linear trend with the remnant belt and the “second slot” locations. The L values of the remnant belt and the “second slot” of different energy electrons decrease as energy increases in general and show interesting characteristics during their temporal evolution. Moreover, the lifetime of the remnant belt of different energy electrons increases as energy increases. We find similarities and differences between sub-MeV and ultra-relativistic electrons three-belt events, which provides a new perspective in three-belt structure study.
Notes
Year of Publication
2021
Journal
Journal of Geophysical Research: Space Physics
Volume
n/a
Number
Number of Pages
e2021JA029385
Date Published
06/2021
URL
https://agupubs.onlinelibrary.wiley.com/doi/abs/10.1029/2021JA029385
DOI
https://doi.org/10.1029/2021JA029385