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| Titel |
EISCAT/CRRES observations: nightside ionospheric ion outflow and oxygen-rich substorm injections |
| VerfasserIn |
N. G. J. Gazey, M. Lockwood, M. Grandé, C. H. Perry, P. N. Smith, S. Coles, A. D. Aylward, R. J. Bunting, H. Opgenoorth, B. Wilken |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
0992-7689
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| Digitales Dokument |
URL |
| Erschienen |
In: Annales Geophysicae ; 14, no. 10 ; Nr. 14, no. 10, S.1032-1043 |
| Datensatznummer |
250012427
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| Publikation (Nr.) |
 copernicus.org/angeo-14-1032-1996.pdf |
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| Zusammenfassung |
| We present combined observations made near
midnight by the EISCAT radar, all-sky cameras and the combined released and
radiation efects satellite (CRRES) shortly before and during a substorm. In
particular, we study a discrete, equatorward-drifting auroral arc, seen several
degrees poleward of the onset region. The arc passes through the field-aligned
beam of the EISCAT radar and is seen to be associated with a considerable upflow
of ionospheric plasma. During the substorm, the CRRES satellite observed two
major injections, 17 min apart, the second of which was dominated by O+
ions. We show that the observed arc was in a suitable location in both latitude
and MLT to have fed O+ ions into the second injection and that the
upward flux of ions associated with it was sufficient to explain the observed
injection. We interpret these data as showing that arcs in the nightside
plasma-sheet boundary layer could be the source of O+ ions energised
by a dipolarisation of the mid- and near-Earth tail, as opposed to ions ejected
from the dayside ionosphere in the cleft ion fountain. |
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