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| Titel |
Ion upflow and downflow at the topside ionosphere observed by the EISCAT VHF radar |
| VerfasserIn |
M. Endo, R. Fujii, Y. Ogawa, S. C. Buchert, S. Nozawa, S. Watanabe, N. Yoshida |
| 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 ; 18, no. 2 ; Nr. 18, no. 2, S.170-181 |
| Datensatznummer |
250013905
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| Publikation (Nr.) |
 copernicus.org/angeo-18-170-2000.pdf |
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| Zusammenfassung |
We have determined the MLT distribution and KP
dependence of the ion upflow and downflow of the thermal bulk oxygen ion
population based on a data analysis using the EISCAT VHF radar CP-7 data
obtained at Tromsø during the period between 1990 and 1996: (1) both ion upflow
and downflow events can be observed at any local time (MLT), irrespective of
dayside and nightside, and under any magnetic disturbance level, irrespective of
quiet and disturbed levels; (2) these upflow and downflow events are more
frequently observed in the nightside than in the dayside; (3) the upflow events
are more frequently observed than the downflow events at any local time except
midnight and at any KP level and the difference of the
occurrence frequencies between the upflow and downflow events is smaller around
midnight; and (4) the occurrence frequencies of both the ion upflow and downflow
events appear to increase with increasing KP level, while the
occurrence frequency of the downflow appears to stop increasing at some KP
level.
Key words: Ionosphere (particle acceleration; plasma
waves and instabilities) - Space plasma physics (transport processes) |
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