期刊
JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS
卷 119, 期 3, 页码 1530-1540出版社
AMER GEOPHYSICAL UNION
DOI: 10.1002/2013JA019446
关键词
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资金
- NASA [NAS5-01072, NNX12AJ55G]
- United States Department of Energy
- NASA's THEMIS mission [NAS5-02099]
- Monitoring, Analyzing, and Assessing the Radiation Belt Loss and Energization (MAARBLE) project under the European Commission's (EC)
- NASA [43398, NNX12AJ55G] Funding Source: Federal RePORTER
On 30 September 2012, a flux dropout occurred throughout Earth's outer electron radiation belt during the main phase of a strong geomagnetic storm. Using eight spacecraft from NASA's Time History of Events and Macroscale Interactions during Substorms (THEMIS) and Van Allen Probes missions and NOAA's Geostationary Operational Environmental Satellites constellation, we examined the full extent and timescales of the dropout based on particle energy, equatorial pitch angle, radial distance, and species. We calculated phase space densities of relativistic electrons, in adiabatic invariant coordinates, which revealed that loss processes during the dropout were >90% effective throughout the majority of the outer belt and the plasmapause played a key role in limiting the spatial extent of the dropout. THEMIS and the Van Allen Probes observed telltale signatures of loss due to magnetopause shadowing and subsequent outward radial transport, including similar loss of energetic ring current ions. However, Van Allen Probes observations suggest that another loss process played a role for multi-MeV electrons at lower L shells (L*
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