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- Title
Rapid Relativistic Electron Enhancements During Van Allen Probes Era.
- Authors
Xiong, Senlin; Dai, Lei; Wang, Xu; Wang, Chi
- Abstract
Relativistic electron fluxes in the outer radiation belt exhibit significant variability during geomagnetic storms and substorms. This study investigates rapid relativistic electron enhancements (REE) in the outer radiation belt throughout the entire Van Allen Probes (RBSP) era from October 2012 to October 2019. Utilizing RBSP measurements, we identify 182 rapid REE events characterized by a factor of greater than two increase in relativistic electron fluxes within a half RBSP orbit (approximately 4.5 hr) at L = 4.5–5.5. Approximately 76% of rapid REE events occur during geomagnetic storms. Rapid REEs during storms are concentrated within the 12‐hr period preceding and the 24‐hr period following the end of the storm's main phase. Intense REE are more likely found in storm's main phase compared to moderate REE. Sub‐relativistic and relativistic electron injections are commonly observed during rapid REE. Substorm activities (AL/AE, MPB index) and convection (AU index) are more intense before and during REE, in contrast to the intervals following REEs. The intensity of rapid REE correlates with the strength of substorms and convection. This comprehensive survey suggests that rapid REEs in the outer radiation belt are likely associated with, but not strictly tied to, geomagnetic storms. Enhanced convection and substorm appear to create favorable conditions for rapid REE. These substorms and enhanced convection are likely linked to favorable solar wind conditions for REEs, as documented in previous studies. Key Points: Approximately 76% of rapid relativistic electron enhancements (REE) occur during stormsEnhanced convection and substorm appear to be favorable conditions for rapid REEHigher intensity REEs correlate with higher levels of the AL/AU/AE index
- Subjects
RELATIVISTIC electrons; MAGNETIC storms; RADIATION belts; STORMS; ORBITS (Astronomy); SOLAR wind
- Publication
Journal of Geophysical Research. Space Physics, 2024, Vol 129, Issue 6, p1
- ISSN
2169-9380
- Publication type
Article
- DOI
10.1029/2024JA032618