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Temporal evolution ...
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Marklund, Göran T.KTH,Alfvénlaboratoriet
(author)
Temporal evolution of the electric field accelerating electrons away from the auroral ionosphere
- Article/chapterEnglish2001
Publisher, publication year, extent ...
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Springer Science and Business Media LLC,2001
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printrdacarrier
Numbers
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LIBRIS-ID:oai:DiVA.org:kth-21169
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https://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-21169URI
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https://doi.org/10.1038/414724aDOI
Supplementary language notes
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Language:English
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Summary in:English
Part of subdatabase
Classification
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Subject category:ref swepub-contenttype
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Subject category:art swepub-publicationtype
Notes
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QC 20100525
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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.
Subject headings and genre
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electrostatic potentials
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current region
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black aurora
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altitude
Added entries (persons, corporate bodies, meetings, titles ...)
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Ivchenko, Nickolay V.KTH,Alfvénlaboratoriet(Swepub:kth)u12jw61z
(author)
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Karlsson, TomasKTH,Alfvénlaboratoriet(Swepub:kth)u154ti5p
(author)
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Fazakerley, A.
(author)
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Dunlop, M.
(author)
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Lindqvist, Per-ArneKTH,Alfvénlaboratoriet(Swepub:kth)u1yukyk9
(author)
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Buchert, S.
(author)
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Owen, C.
(author)
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Taylor, M.
(author)
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Vaivalds, A.
(author)
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Carter, P.
(author)
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Andre, M.
(author)
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Balogh, A.
(author)
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KTHAlfvénlaboratoriet
(creator_code:org_t)
Related titles
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In:Nature: Springer Science and Business Media LLC414:6865, s. 724-7270028-08361476-4687
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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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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.
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Andre, M.
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Balogh, A.
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Nature
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Royal Institute of Technology