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In situ spatiotempo...
In situ spatiotemporal measurements of the detailed azimuthal substructure of the substorm current wedge
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Forsyth, C. (författare)
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Fazakerley, A. N. (författare)
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Rae, I. J. (författare)
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visa fler...
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Watt, C. E. J. (författare)
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Murphy, K. (författare)
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Wild, J. A. (författare)
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- Karlsson, Tomas (författare)
- KTH,Rymd- och plasmafysik
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Mutel, R. (författare)
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Owen, C. J. (författare)
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Ergun, R. (författare)
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Masson, A. (författare)
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Berthomier, M. (författare)
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Donovan, E. (författare)
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Frey, H. U. (författare)
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Matzka, J. (författare)
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Stolle, C. (författare)
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Zhang, Y. (författare)
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(creator_code:org_t)
- 2014
- 2014
- Engelska.
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Ingår i: Journal of Geophysical Research: Space Physics. - 2169-9380. ; 119:2, s. 927-946
- Relaterad länk:
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https://urn.kb.se/re...
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https://doi.org/10.1...
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Abstract
Ämnesord
Stäng
- The substorm current wedge (SCW) is a fundamental component of geomagnetic substorms. Models tend to describe the SCW as a simple line current flowing into the ionosphere toward dawn and out of the ionosphere toward dusk, linked by a westward electrojet. We use multispacecraft observations from perigee passes of the Cluster 1 and 4 spacecraft during a substorm on 15 January 2010, in conjunction with ground-based observations, to examine the spatial structuring and temporal variability of the SCW. At this time, the spacecraft traveled east-west azimuthally above the auroral region. We show that the SCW has significant azimuthal substructure on scales of 100km at altitudes of 4000-7000km. We identify 26 individual current sheets in the Cluster 4 data and 34 individual current sheets in the Cluster 1 data, with Cluster 1 passing through the SCW 120-240s after Cluster 4 at 1300-2000km higher altitude. Both spacecraft observed large-scale regions of net upward and downward field-aligned current, consistent with the large-scale characteristics of the SCW, although sheets of oppositely directed currents were observed within both regions. We show that the majority of these current sheets were closely aligned to a north-south direction, in contrast to the expected east-west orientation of the preonset aurora. Comparing our results with observations of the field-aligned current associated with bursty bulk flows (BBFs), we conclude that significant questions remain for the explanation of SCW structuring by BBF-driven wedgelets. Our results therefore represent constraints on future modeling and theoretical frameworks on the generation of the SCW.
Ämnesord
- NATURVETENSKAP -- Fysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences (hsv//eng)
Nyckelord
- Substorm current wedge
- Field-aligned current
- Wedgelets
- Aurora
- Magnetosphere
- Earth
Publikations- och innehållstyp
- ref (ämneskategori)
- art (ämneskategori)
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Till lärosätets databas
- Av författaren/redakt...
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Forsyth, C.
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Fazakerley, A. N ...
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Rae, I. J.
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Watt, C. E. J.
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Murphy, K.
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Wild, J. A.
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visa fler...
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Karlsson, Tomas
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Mutel, R.
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Owen, C. J.
-
Ergun, R.
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Masson, A.
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Berthomier, M.
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Donovan, E.
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Frey, H. U.
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Matzka, J.
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Stolle, C.
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Zhang, Y.
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visa färre...
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