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| Titel |
Observations of diverging field-aligned ion flow with the ESR |
| VerfasserIn |
S. C. Buchert, Y. Ogawa, R. Fujii, A. P. Eyken |
| 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 ; 22, no. 3 ; Nr. 22, no. 3 (2004-03-19), S.889-899 |
| Datensatznummer |
250014809
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| Publikation (Nr.) |
 copernicus.org/angeo-22-889-2004.pdf |
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| Zusammenfassung |
We report on observations of a diverging ion flow along the
geomagnetic field that is often seen at the EISCAT Svalbard radar.
The flow is upward above the peak of the electron density in the F-region
and downward below the peak. We estimate that in such events
mass transport along the field line is important for the ionization
balance, and that the shape of the F-layer and its ion composition
should be strongly influenced by it. Diverging flow typically
occurs when there are signatures of direct entry of sheath plasma to
the ionosphere in the form of intense soft particle precipitation, and
we suggest that it is caused by the ionization and ionospheric
electron heating associated with this precipitation. On average,
30% of all events with ion upflow also show significant ion
downflow below.
Key words.Ionosphere (polar ionosphere; ionization mechanism;
plasma temperature and density) |
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