The global context of the 14 November 2012 storm event

K.‐J Hwang; D. G Sibeck; M.‐C. H Fok; Y Zheng; Y Nishimura; J.‐J Lee; A Glocer; N Partamies; H. J Singer; G. D Reeves; D. G Mitchell; C. A Kletzing; T Onsager

doi:10.1002/2014JA020826

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The global context of the 14 November 2012 storm event

Journal article

Peer reviewed

The global context of the 14 November 2012 storm event

K.‐J Hwang, D. G Sibeck, M.‐C. H Fok, Y Zheng, Y Nishimura, J.‐J Lee, A Glocer, N Partamies, H. J Singer, G. D Reeves, …

Journal of geophysical research. Space physics, Vol.120(3), pp.1939-1956

03/2015

DOI: 10.1002/2014JA020826

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https://www.osti.gov/biblio/1200614View

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Abstract

From 2 to 5 UT on 14 November 2012, the Van Allen Probes observed repeated particle flux dropouts during the main phase of a geomagnetic storm as the satellites traversed the post‐midnight to dawnside inner magnetosphere. Each flux dropout corresponded to an abrupt change in the magnetic topology, i.e., from a more dipolar configuration to a configuration with magnetic field lines stretched in the dawn‐dusk direction. Geosynchronous GOES spacecraft located in the dusk and near‐midnight sectors and the LANL constellation with wide local time coverage also observed repeated flux dropouts and stretched field lines with similar occurrence patterns to those of the Van Allen Probe events. THEMIS recorded multiple transient abrupt expansions of the evening‐side magnetopause ∼20–30 min prior to the sequential Van Allen Probes observations. Ground‐based magnetograms and all sky images demonstrate repeatable features in conjunction with the dropouts. We combine the various in situ and ground‐based measurements to define and understand the global spatiotemporal features associated with the dropouts observed by the Van Allen Probes. We discuss various proposed hypotheses for the mechanism that plausibly caused this storm‐time dropout event as well as formulate a new hypothesis that explains the combined in situ and ground‐based observations: the earthward motion of magnetic flux ropes containing lobe plasmas that form along an extended magnetotail reconnection line in the near‐Earth plasma sheet. Key Points The cause of multiple flux dropouts during the storm main phase Comprehensive analyses using data from multispacecraft and ground monitors Propagation from tail to inner magnetosphere of flux rope containing lobe plasma

flux dropout

flux rope

geomagnetic storm

radiation belt

Van Allen Probes

Details

Title: Subtitle: The global context of the 14 November 2012 storm event
Creators: K.‐J Hwang - University of Maryland, Baltimore County
D. G Sibeck - Goddard Space Flight Center
M.‐C. H Fok - Goddard Space Flight Center
Y Zheng - Goddard Space Flight Center
Y Nishimura - University of California, Los Angeles
J.‐J Lee - Korea Astronomy and Space Science Institute
A Glocer - Goddard Space Flight Center
N Partamies - Finnish Meteorological Institute
H. J Singer - National Oceanic and Atmospheric Administration
G. D Reeves - Los Alamos National Laboratory
D. G Mitchell - Johns Hopkins University
C. A Kletzing - University of Iowa
T Onsager - National Oceanic and Atmospheric Administration
Resource Type: Journal article
Publication Details: Journal of geophysical research. Space physics, Vol.120(3), pp.1939-1956
DOI: 10.1002/2014JA020826
ISSN: 2169-9380
eISSN: 2169-9402
Number of pages: 18
Grant note: NSF Magnetospheric Physics (AGS‐1305374) NASA's Van Allen Probes
Language: English
Date published: 03/2015
Academic Unit: Physics and Astronomy
Record Identifier: 9984199947402771

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