Journal article
Van Allen Probes Measurements of Energetic Particle Deep Penetration Into the Low L Region (L < 4) During the Storm on 8 April 2016
Journal of geophysical research. Space physics, Vol.122(12), pp.12,140-12,152
11/06/2017
DOI: 10.1002/2017JA024558
Abstract
In this paper, using measurements from the Van Allen Probes, a penetration event of tens to hundreds of keV electrons and tens of keV protons into the low L shells (L < 4) is studied. Timing and magnetic local time (MLT) differences of energetic particle deep penetration are unveiled and underlying physical processes are examined. During this event, both proton and electron penetrations are MLT asymmetric. The observed MLT difference of proton penetration is consistent with convection of plasma sheet protons, suggesting enhanced convection during geomagnetic active times to be the cause of energetic proton deep penetration during this event. The observed MLT difference of tens to hundreds of keV electron penetration is completely different from tens of keV protons and cannot be well explained by inward radial diffusion, convection of plasma sheet electrons, or transport of trapped electrons by enhanced convection electric field represented by the Volland-Stern model or a uniform dawn-dusk electric field model based on the electric field measurements. Finally, it suggests that the underlying physical mechanism responsible for energetic electron deep penetration, which is very important for fully understanding energetic electron dynamics in the low L shells, should be MLT localized.
Details
- Title: Subtitle
- Van Allen Probes Measurements of Energetic Particle Deep Penetration Into the Low L Region (L < 4) During the Storm on 8 April 2016
- Creators
- H Zhao - University of Colorado BoulderD. N Baker - University of Colorado BoulderS Califf - Cooperative Institute for Research in Environmental SciencesX Li - University of Colorado BoulderA. N Jaynes - University of Colorado BoulderT Leonard - University of Colorado BoulderS. G Kanekal - Goddard Space Flight CenterJ. B Blake - The Aerospace CorporationJ. F Fennell - The Aerospace CorporationS. G Claudepierre - The Aerospace CorporationD. L Turner - The Aerospace CorporationG. D Reeves - Los Alamos National LaboratoryH. E Spence - University of New Hampshire
- Resource Type
- Journal article
- Publication Details
- Journal of geophysical research. Space physics, Vol.122(12), pp.12,140-12,152
- Publisher
- American Geophysical Union
- DOI
- 10.1002/2017JA024558
- ISSN
- 2169-9380
- eISSN
- 2169-9402
- Grant note
- DOI: 10.13039/100000104, name: National Aeronautics and Space Administration, award: NAS5‐01072
- Language
- English
- Date published
- 11/06/2017
- Academic Unit
- Physics and Astronomy; University College Courses
- Record Identifier
- 9984199770802771
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