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| Titel |
Statistics of high-altitude and high-latitude O+ ion outflows observed by Cluster/CIS |
| VerfasserIn |
S. Arvelius, M. Yamauchi, H. Nilsson, R. Lundin, Y. Hobara, H. Rème, M. B. Bavassano-Cattaneo, G. Paschmann, A. Korth, L. M. Kistler, G. K. Parks |
| 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 ; 23, no. 5 ; Nr. 23, no. 5 (2005-07-28), S.1909-1916 |
| Datensatznummer |
250015275
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| Publikation (Nr.) |
 copernicus.org/angeo-23-1909-2005.pdf |
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| Zusammenfassung |
| The persistent outflows of O+ ions observed by
the Cluster CIS/CODIF instrument were studied statistically
in the high-altitude (from 3 up to 11 RE)
and high-latitude (from 70 to ~90 deg invariant latitude,
ILAT) polar region. The principal results are: (1) Outflowing
O+ ions with more than 1keV are observed above 10 RE geocentric distance and above 85deg ILAT location;
(2) at 6-8 RE geocentric distance, the latitudinal
distribution of O+ ion outflow is consistent with velocity
filter dispersion from a source equatorward and below the
spacecraft (e.g. the cusp/cleft); (3) however, at 8-12 RE
geocentric distance the distribution of O+ outflows cannot
be explained by velocity filter only. The results suggest
that additional energization or acceleration processes for
outflowing O+ ions occur at high altitudes and high
latitudes in the dayside polar region.
Keywords. Magnetospheric physics (Magnetospheric configuration
and dynamics, Solar wind-magnetosphere interactions) |
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