Journal article
Characteristics of High-Energy Proton Responses to Geomagnetic Activities in the Inner Radiation Belt Observed by the RBSP Satellite
Journal of geophysical research. Space physics, Vol.124(9), pp.7581-7591
09/01/2019
DOI: 10.1029/2018JA026205
Abstract
High-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 (>20 MeV) protons variations during geomagnetic activity times have been studied by implementing 4-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 4-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 flux 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.
Details
- Title: Subtitle
- Characteristics of High-Energy Proton Responses to Geomagnetic Activities in the Inner Radiation Belt Observed by the RBSP Satellite
- Creators
- Jiyao Xu - Chinese Acad Sci, Natl Space Sci Ctr, State Key Lab Space Weather, Beijing, Peoples R ChinaZhaohai He - Chinese Academy of SciencesD. N. Baker - University of Colorado BoulderIlan Roth - University of California, BerkeleyChi Wang - Chinese Academy of SciencesS. G. Kanekal - Goddard Space Flight CenterA. N. Jaynes - Laboratory for Atmospheric and Space PhysicsXiao Liu - Henan Normal University
- Resource Type
- Journal article
- Publication Details
- Journal of geophysical research. Space physics, Vol.124(9), pp.7581-7591
- Publisher
- Amer Geophysical Union
- DOI
- 10.1029/2018JA026205
- ISSN
- 2169-9380
- eISSN
- 2169-9402
- Number of pages
- 11
- Grant note
- DOI: 10.13039/100000104, name: National Aeronautics and Space Administration, award: NNN06AA01C; DOI: 10.13039/501100001809, name: National Natural Science Foundation of China, award: 41831073, 41674152
- Language
- English
- Date published
- 09/01/2019
- Academic Unit
- Physics and Astronomy; University College Courses
- Record Identifier
- 9984428765002771
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