Relativistic electron response to the combined magnetospheric impact of a coronal mass ejection overlapping with a high‐speed stream: Van Allen Probes observations

S. G Kanekal; A. F Ali; A Jaynes; D. N Baker; W Li; X Li; C. A Kletzing; M. G Henderson; J. F Fennell; Y Zheng; I. G Richardson; A Jones; S. R Elkington; J. B Blake; G. D Reeves; H. E Spence

doi:10.1002/2015JA021395

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Relativistic electron response to the combined magnetospheric impact of a coronal mass ejection overlapping with a high‐speed stream: Van Allen Probes observations

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Relativistic electron response to the combined magnetospheric impact of a coronal mass ejection overlapping with a high‐speed stream: Van Allen Probes observations

S. G Kanekal, A. F Ali, A Jaynes, D. N Baker, W Li, X Li, C. A Kletzing, M. G Henderson, J. F Fennell, Y Zheng, …

Journal of geophysical research. Space physics, Vol.120(9), pp.7629-7641

09/2015

DOI: 10.1002/2015JA021395

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Abstract

During early November 2013, the magnetosphere experienced concurrent driving by a coronal mass ejection (CME) during an ongoing high‐speed stream (HSS) event. The relativistic electron response to these two kinds of drivers, i.e., HSS and CME, is typically different, with the former often leading to a slower buildup of electrons at larger radial distances, while the latter energizing electrons rapidly with flux enhancements occurring closer to the Earth. We present a detailed analysis of the relativistic electron response including radial profiles of phase space density as observed by both Magnetic Electron and Ion Sensor (MagEIS) and Relativistic Electron Proton Telescope instruments on the Van Allen Probes mission. Data from the MagEIS instrument establish the behavior of lower energy (<1 MeV) electrons which span both intermediary and seed populations during electron energization. Measurements characterizing the plasma waves and magnetospheric electric and magnetic fields during this period are obtained by the Electric and Magnetic Field Instrument Suite and Integrated Science instrument on board Van Allen Probes, Search Coil Magnetometer and Flux Gate Magnetometer instruments on board Time History of Events and Macroscale Interactions during Substorms, and the low‐altitude Polar‐orbiting Operational Environmental Satellites. These observations suggest that during this time period, both radial transport and local in situ processes are involved in the energization of electrons. The energization attributable to radial diffusion is most clearly evident for the lower energy (<1 MeV) electrons, while the effects of in situ energization by interaction of chorus waves are prominent in the higher‐energy electrons. Key Points Electrons are energized by concurrent radial transport and in situ processes Energization is driven by CME overlapping with HSS Strong chorus and ULF wave activity are observed during energization

CME

HSS

IP shock

relativistic electrons

Details

Title: Subtitle: Relativistic electron response to the combined magnetospheric impact of a coronal mass ejection overlapping with a high‐speed stream: Van Allen Probes observations
Creators: S. G Kanekal - Goddard Space Flight Center
A. F Ali - University of Colorado Boulder
A Jaynes - University of Colorado Boulder
D. N Baker - University of Colorado Boulder
W Li - University of California, Los Angeles
X Li - Goddard Space Flight Center
C. A Kletzing - University of Iowa
M. G Henderson - Los Alamos National Laboratory
J. F Fennell - The Aerospace Corporation
Y Zheng - Goddard Space Flight Center
I. G Richardson - Goddard Space Flight Center
A Jones - Catholic University of America
S. R Elkington - University of Colorado Boulder
J. B Blake - The Aerospace Corporation
G. D Reeves - Los Alamos National Laboratory
H. E Spence - University of New Hampshire
Resource Type: Journal article
Publication Details: Journal of geophysical research. Space physics, Vol.120(9), pp.7629-7641
DOI: 10.1002/2015JA021395
ISSN: 2169-9380
eISSN: 2169-9402
Number of pages: 13
Grant note: NSF (AGS 1405054) NASA (NNX11AD75G; NNX11AR64G; NNX13AI61G; NNX15AF61G) JHU/APL (967399; NAS5-01072)
Language: English
Date published: 09/2015
Academic Unit: Physics and Astronomy; University College Courses
Record Identifier: 9984199680602771

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