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Van Allen Probes, THEMIS, GOES, and Cluster observations of EMIC waves, ULF pulsations, and an electron flux dropout
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SYSNO ASEP 0459490 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Van Allen Probes, THEMIS, GOES, and Cluster observations of EMIC waves, ULF pulsations, and an electron flux dropout Author(s) Sigsbee, K. (US)
Kletzing, C. A. (US)
Smith, C. W. (US)
MacDowall, R. (US)
Spence, H. (US)
Reeves, G. (US)
Blake, J. B. (US)
Baker, D. N. (US)
Green, J. C. (US)
Singer, H. J. (US)
Carr, C. (GB)
Santolík, Ondřej (UFA-U) RID, ORCIDSource Title Journal of Geophysical Research-Space Physics. - : Wiley - ISSN 2169-9380
Roč. 121, č. 3 (2016), s. 1990-2008Number of pages 19 s. Language eng - English Country US - United States Keywords EMIC waves ; ULF pulsations ; electron flux dropouts ; Dst effect ; magnetopause shadowing ; Van Allen Probes Subject RIV BL - Plasma and Gas Discharge Physics Institutional support UFA-U - RVO:68378289 UT WOS 000374730900013 EID SCOPUS 84959522860 DOI 10.1002/2014JA020877 Annotation We examined an electron flux dropout during the 12–14 November 2012 geomagnetic storm using observations from seven spacecraft: the two Van Allen Probes, Time History of Events and Macroscale Interactions during Substorms (THEMIS)-A (P5), Cluster 2, and Geostationary Operational Environmental Satellites (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 h from 12 to 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+ electromagnetic ion cyclotron (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 prestorm values, possibly in response to strong ultralow 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. Workplace Institute of Atmospheric Physics Contact Kateřina Adamovičová, adamovicova@ufa.cas.cz, Tel.: 272 016 012 ; Kateřina Potužníková, kaca@ufa.cas.cz, Tel.: 272 016 019 Year of Publishing 2017
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