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Evolution of dipola...
Evolution of dipolarization in the near-Earth current sheet induced by Earthward rapid flux transport
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Nakamura, R. (författare)
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Retino, A. (författare)
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Baumjohann, W. (författare)
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Volwerk, M. (författare)
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Erkaev, N. (författare)
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Klecker, B. (författare)
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Lucek, E. A. (författare)
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Dandouras, I. (författare)
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- André, Mats (författare)
- Uppsala universitet,Institutet för rymdfysik, Uppsalaavdelningen
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- Khotyaintsev, Yuri (författare)
- Uppsala universitet,Institutet för rymdfysik, Uppsalaavdelningen
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(creator_code:org_t)
- 2009-04-09
- 2009
- Engelska.
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Ingår i: Annales Geophysicae. - : Copernicus GmbH. - 0992-7689 .- 1432-0576. ; 27:4, s. 1743-1754
- Relaterad länk:
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https://doi.org/10.5...
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https://urn.kb.se/re...
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https://doi.org/10.5...
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Abstract
Ämnesord
Stäng
- We report on the evolution of dipolarization and associated disturbances of the near-Earth current sheet during a substorm on 27 October 2007, based upon Cluster multi-point, multi-scale observations of the night-side plasma sheet at X similar to - 10R(E). Three dipolarization events were observed accompanied by activations on ground magnetograms at 09: 07, 09: 14, and 09: 22 UT. We found that all these events consist of two types of dipolarization signatures: (1) Earthward moving dipolarization pulse, which is accompanied by enhanced rapid Earthward flux transport and is followed by current sheet disturbances with decrease in B-Z and enhanced local current density, and subsequent (2) increase in B-Z toward a stable level, which is more prominent at Earthward side and evolving tailward. During the 09: 07 event, when Cluster was located in a thin current sheet, the dipolarization and fast Earthward flows were also accompanied by further thinning of the current sheet down to a half-thickness of about 1000 km and oscillation in a kink-like mode with a period of similar to 15 s and propagating duskward. Probable cause of this "flapping current sheet" is shown to be the Earthward high-speed flow. The oscillation ceased as the flow decreased and the field configuration became more dipolar. The later rapid flux transport events at 09: 14 and 09: 22 UT took place when the field configuration was initially more dipolar and were also associated with B-Z disturbance and local current density enhancement, but to a lesser degree. Hence, current sheet disturbances induced by initial dipolarization pulses could differ, depending on the configuration of the current sheet.
Ämnesord
- NATURVETENSKAP -- Fysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences (hsv//eng)
Nyckelord
- Magnetospheric physics
- Plasma convection
- Plasma sheet
- Storms and substorms
- Physics
- Fysik
Publikations- och innehållstyp
- ref (ämneskategori)
- art (ämneskategori)
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Till lärosätets databas
- Av författaren/redakt...
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Nakamura, R.
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Retino, A.
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Baumjohann, W.
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Volwerk, M.
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Erkaev, N.
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Klecker, B.
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visa fler...
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Lucek, E. A.
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Dandouras, I.
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André, Mats
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Khotyaintsev, Yu ...
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visa färre...
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Annales Geophysi ...
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Uppsala universitet