onr:"swepub:oai:DiVA.org:kth-21169"
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| Fältnamn | Indikatorer | Metadata |
|---|---|---|
| 000 | 03084naa a2200457 4500 | |
| 001 | oai:DiVA.org:kth-21169 | |
| 003 | SwePub | |
| 008 | 100810s2001 | |||||||||||000 ||eng| | |
| 024 | 7 | a https://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-211692 URI |
| 024 | 7 | a https://doi.org/10.1038/414724a2 DOI |
| 040 | a (SwePub)kth | |
| 041 | a engb eng | |
| 042 | 9 SwePub | |
| 072 | 7 | a ref2 swepub-contenttype |
| 072 | 7 | a art2 swepub-publicationtype |
| 100 | 1 | a Marklund, Göran T.u KTH,Alfvénlaboratoriet4 aut0 (Swepub:kth)u1yq52h6 |
| 245 | 1 0 | a Temporal evolution of the electric field accelerating electrons away from the auroral ionosphere |
| 264 | 1 | b Springer Science and Business Media LLC,c 2001 |
| 338 | a print2 rdacarrier | |
| 500 | a QC 20100525 | |
| 520 | a 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. | |
| 653 | a electrostatic potentials | |
| 653 | a current region | |
| 653 | a black aurora | |
| 653 | a altitude | |
| 700 | 1 | a Ivchenko, Nickolay V.u KTH,Alfvénlaboratoriet4 aut0 (Swepub:kth)u12jw61z |
| 700 | 1 | a Karlsson, Tomasu KTH,Alfvénlaboratoriet4 aut0 (Swepub:kth)u154ti5p |
| 700 | 1 | a Fazakerley, A.4 aut |
| 700 | 1 | a Dunlop, M.4 aut |
| 700 | 1 | a Lindqvist, Per-Arneu KTH,Alfvénlaboratoriet4 aut0 (Swepub:kth)u1yukyk9 |
| 700 | 1 | a Buchert, S.4 aut |
| 700 | 1 | a Owen, C.4 aut |
| 700 | 1 | a Taylor, M.4 aut |
| 700 | 1 | a Vaivalds, A.4 aut |
| 700 | 1 | a Carter, P.4 aut |
| 700 | 1 | a Andre, M.4 aut |
| 700 | 1 | a Balogh, A.4 aut |
| 710 | 2 | a KTHb Alfvénlaboratoriet4 org |
| 773 | 0 | t Natured : Springer Science and Business Media LLCg 414:6865, s. 724-727q 414:6865<724-727x 0028-0836x 1476-4687 |
| 856 | 4 8 | u https://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-21169 |
| 856 | 4 8 | u https://doi.org/10.1038/414724a |
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