Van Allen Probes Measurements of Energetic Particle Deep Penetration Into the Low L Region (L < 4) During the Storm on 8 April 2016

Zhao, H.; Baker, D. N.; Califf, S.; Li, X.; Jaynes, A. N.; Leonard, T.; Kanekal, S. G.; Blake, J. B.; Fennell, J. F.; Claudepierre, S. G.; Turner, D. L.; Reeves, G. D.; Spence, H. E.

doi:10.1002/2017ja024558

i

Van Allen Probes Measurements of Energetic Particle Deep Penetration Into the Low L Region (L < 4) During the Storm on 8 April 2016

2017
By Zhao, H. ; Baker, D. N. ; Califf, S. ; ...

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Journal Title:

Journal of Geophysical Research: Space Physics
Personal Author:

Zhao, H. ; Baker, D. N. ; Califf, S. ; Li, X. ; Jaynes, A. N. ; Leonard, T. ; Kanekal, S. G. ; Blake, J. B. ; Fennell, J. F. ; Claudepierre, S. G. ; Turner, D. L. ; Reeves, G. D. ; Spence, H. E.
NOAA Program & Office:

NESDIS (National Environmental Satellite, Data, and Information Service) ; CIRES (Cooperative Institute for Research in Environmental Sciences) ; NCEI (National Centers for Environmental Information)
Description:

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. 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.
Source:

Journal of Geophysical Research: Space Physics, 122(12)
DOI:

https://doi.org/10.1002/2017ja024558
ISSN:

2169-9380 ; 2169-9402
Format:

pdf
Publisher:

American Geophysical Union (AGU)
Document Type:

Journal Article
Rights Information:

Other
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Library
Main Document Checksum:

urn:sha-512:79943433205cb22cc1815b6ced8c3bddc487564fc1b98900ea23e6333c3134138d78d89d960e6d4150450c1bbd119449ada05169198a8d785e6b00942fa098dd
Download URL:

https://repository.library.noaa.gov/view/noaa/68074/noaa_68074_DS1.pdf
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[PDF - 1.75 MB ]

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