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Temporal evolution ...
Temporal evolution of the electric field accelerating electrons away from the auroral ionosphere
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- Marklund, Göran T. (författare)
- KTH,Alfvénlaboratoriet
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- Ivchenko, Nickolay V. (författare)
- KTH,Alfvénlaboratoriet
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- Karlsson, Tomas (författare)
- KTH,Alfvénlaboratoriet
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Fazakerley, A. (författare)
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Dunlop, M. (författare)
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- Lindqvist, Per-Arne (författare)
- KTH,Alfvénlaboratoriet
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Buchert, S. (författare)
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Owen, C. (författare)
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Taylor, M. (författare)
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Vaivalds, A. (författare)
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Carter, P. (författare)
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Andre, M. (författare)
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Balogh, A. (författare)
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(creator_code:org_t)
- Springer Science and Business Media LLC, 2001
- 2001
- Engelska.
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Ingår i: Nature. - : Springer Science and Business Media LLC. - 0028-0836 .- 1476-4687. ; 414:6865, s. 724-727
- 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 bright night-time aurorae that are visible to the unaided eye are caused by electrons accelerated towards Earth by an upward-pointing electric field(1-3). On adjacent geomagnetic field lines the reverse process occurs: a downward-pointing electric field accelerates electrons away from Earth(4-11). Such magnetic-field-aligned electric fields in the collisionless plasma above the auroral ionosphere have been predicted(12), but how they could be maintained is still a matter for debate(13). The spatial and temporal behaviour of the electric fields-a knowledge of which is crucial to an understanding of their nature-cannot be resolved uniquely by single satellite measurements. Here we report on the first observations by a formation of identically instrumented satellites crossing a beam of upward-accelerated electrons. The structure of the electric potential accelerating the beam grew in magnitude and width for about 200 s, accompanied by a widening of the downward-current sheet, with the total current remaining constant. The 200-s timescale suggests that the evacuation of the electrons from the ionosphere contributes to the formation of the downward-pointing magnetic-field-aligned electric fields. This evolution implies a growing load in the downward leg of the current circuit, which may affect the visible discrete aurorae.
Nyckelord
- electrostatic potentials
- current region
- black aurora
- altitude
Publikations- och innehållstyp
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- art (ämneskategori)
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Marklund, Göran ...
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Ivchenko, Nickol ...
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Karlsson, Tomas
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Fazakerley, A.
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Dunlop, M.
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Lindqvist, Per-A ...
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visa fler...
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Buchert, S.
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Owen, C.
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Taylor, M.
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Vaivalds, A.
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Carter, P.
-
Andre, M.
-
Balogh, A.
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visa färre...
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Kungliga Tekniska Högskolan