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  4. Van Allen Probes, THEMIS, GOES, and Cluster Observations of EMIC waves, ULF pulsations, and an electron flux dropout
 
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Van Allen Probes, THEMIS, GOES, and Cluster Observations of EMIC waves, ULF pulsations, and an electron flux dropout
File(s)
Sigsbee_et_al-2016-Journal_of_Geophysical_Research-_Space_Physics.pdf (16.85 MB)
Published version
764855_4_merged_1449268903.pdf (6.97 MB)
Accepted version
Author(s)
Sigsbee, K
Kletzing, CA
Smith, CW
MacDowall, R
Spence, H
more
Type
Journal Article
Abstract
We examined an electron flux dropout during the 12–14 November 2012 geomagnetic storm using observations from seven spacecraft: the two Van Allen Probes, THEMIS-A (P5), Cluster 2, and Geostationary Operational Environmental Satellite (GOES) 13, 14, and 15. The electron fluxes for energies greater than 2.0 MeV observed by GOES 13, 14, and 15 at geosynchronous orbit and by the Van Allen Probes remained at or near instrumental background levels for more than 24 hours from 12–14 November. For energies of 0.8 MeV, the GOES satellites observed two shorter intervals of reduced electron fluxes. The first interval of reduced 0.8 MeV electron fluxes on 12–13 November was associated with an interplanetary shock and a sudden impulse. Cluster, THEMIS, and GOES observed intense He+ EMIC waves from just inside geosynchronous orbit out to the magnetopause across the dayside to the dusk flank. The second interval of reduced 0.8 MeV electron fluxes on 13–14 November was associated with a solar sector boundary crossing and development of a geomagnetic storm with Dst < −100 nT. At the start of the recovery phase, both the 0.8 and 2.0 MeV electron fluxes finally returned to near pre-storm values, possibly in response to strong ultra-low frequency (ULF) waves observed by the Van Allen Probes near dawn. A combination of adiabatic effects, losses to the magnetopause, scattering by EMIC waves, and acceleration by ULF waves can explain the observed electron behavior.
Date Issued
2016-01-28
Date Acceptance
2016-01-22
Citation
Journal of Geophysical Research: Space Physics, 2016, 121 (3), pp.1990-2008
URI
http://hdl.handle.net/10044/1/29080
DOI
https://www.dx.doi.org/10.1002/2014JA020877
ISSN
2169-9402
Publisher
American Geophysical Union (AGU)
Chapter
2016-09-4
Start Page
1990
End Page
2008
Journal / Book Title
Journal of Geophysical Research: Space Physics
Volume
121
Issue
3
Copyright Statement
This is the peer reviewed version of the following article: Sigsbee, K., C. A. Kletzing, C. W. Smith, R. MacDowall, H. Spence, G. Reeves, J. B. Blake, D. N. Baker, J. C. Green, H. J. Singer, et al. (2016), Van Allen Probes, THEMIS, GOES, and Cluster observations of EMIC waves, ULF pulsations, and an electron flux dropout, J. Geophys. Res. Space Physics, 121, 1990–2008, which has been published in final form at http://onlinelibrary.wiley.com/doi/10.1002/2014JA020877/abstract.  This article may be used for non-commercial purposes in accordance With Wiley Terms and Conditions for self-archiving.
Sponsor
Science and Technology Facilities Council (STFC)
Science and Technology Facilities Council (STFC)
Science and Technology Facilities Council (STFC)
Science and Technology Facilities Council (STFC)
Science and Technology Facilities Council (STFC)
Science and Technology Facilities Council (STFC)
Grant Number
ST/H00419X/1
ST/G008272/1
ST/J004553/1
ST/K001051/1
ST/L001276/1
ST/M003116/1
Publication Status
Published
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