Characteristics of high energy proton responses to geomagnetic activities in the inner radiation belt observed by the RBSP satellite

TitleCharacteristics of high energy proton responses to geomagnetic activities in the inner radiation belt observed by the RBSP satellite
Publication TypeJournal Article
Year of Publication2019
AuthorsXu, J, He, Z, Baker, DN, Roth, I, Wang, C, Kanekal, SG, Jaynes, AN, Liu, X
JournalJournal of Geophysical Research: Space Physics
Date Published05/2019
ISSN2169-9380
Keywordsgeomagnetic activities; high energy proton; Inner radiation belt; one‐to‐one correspondence; prompt responses; RBSP satellite; Van Allen Probes
AbstractHigh energy trapped particles in the radiation belts constitute potential threats to the functionality of satellites as they enter into those regions. In the inner radiation belt, the characteristics of high‐energy (>20MeV) protons variations during geomagnetic activity times have been studied by implementing four‐year (2013‐2016) observations of the Van Allen probes. An empirical formula has been used to remove the satellite orbit effect, by which proton fluxes have been normalized to the geomagnetic equator. Case studies show that the region of L<1.7 is relatively stable, while L>1.7 is more dynamic and the most significant variation of proton fluxes occurs at L=2.0. The four‐year survey at L=2.0 indicates that for every geomagnetic storm, sharp descent in proton fluxes is accompanied by the corresponding depression of SYM‐H index, with a one‐to‐one correspondence, regardless of the storm intensity. Proton fluxes dropouts are synchronous with SYM‐H reduction with similar short timescales. Our observational results reveal that high‐energy protons in the inner radiation belt are very dynamic, especially for the outer zone of the inner belt, which is beyond our previous knowledge.
URLhttps://agupubs.onlinelibrary.wiley.com/doi/10.1029/2018JA026205
DOI10.1029/2018JA026205
Short TitleJ. Geophys. Res. Space Physics


Page Last Modified: August 5, 2019