期刊
GEOPHYSICAL RESEARCH LETTERS
卷 41, 期 1, 页码 7-12出版社
AMER GEOPHYSICAL UNION
DOI: 10.1002/2013GL058485
关键词
relativistic electrons; outer radiation belt; enhancement; phase space density; internal acceleration; rapid radial transport
资金
- Directorate For Geosciences
- Div Atmospheric & Geospace Sciences [1131869] Funding Source: National Science Foundation
Despite the lack of a geomagnetic storm (based on the Dst index), relativistic electron fluxes were enhanced over 2.5 orders of magnitude in the outer radiation belt in 13h on 13-14 January 2013. The unusual enhancement was observed by Magnetic Electron Ion Spectrometer (MagEIS), onboard the Van Allen Probes; Relativistic Electron and Proton Telescope Integrated Little Experiment, onboard the Colorado Student Space Weather Experiment; and Solid State Telescope, onboard Time History of Events and Macroscale Interactions during Substorms (THEMIS). Analyses of MagEIS phase space density (PSD) profiles show a positive outward radial gradient from 4<5.5. However, THEMIS observations show a peak in PSD outside of the Van Allen Probes' apogee, which suggest a very interesting scenario: wave-particle interactions causing a PSD peak at similar to L*=5.5 from where the electrons are then rapidly transported radially inward. This letter demonstrates, for the first time in detail, that geomagnetic storms are not necessary for causing dramatic enhancements in the outer radiation belt.
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