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| Titel |
Longitudinal dependence of middle and low latitude zonal plasma drifts measured by DE-2 |
| VerfasserIn |
J. W. Jensen, B. G. Fejer |
| 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 ; 25, no. 12 ; Nr. 25, no. 12 (2008-01-02), S.2551-2559 |
| Datensatznummer |
250015961
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| Publikation (Nr.) |
 copernicus.org/angeo-25-2551-2007.pdf |
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| Zusammenfassung |
| We used ion drift observations from the DE-2 satellite to
study for the first time the longitudinal variations of middle and low
latitude F region zonal plasma drifts during quiet and disturbed conditions.
The quiet-time middle latitude drifts are predominantly westward; the low
latitude drifts are westward during the day and eastward at night. The
daytime quiet-time drifts do not change much with longitude; the nighttime
drifts have strong season dependent longitudinal variations. In the
dusk-premidnight period, the equinoctial middle latitude westward drifts are
smallest in the European sector and the low latitude eastward drifts are
largest in the American-Pacific sector. The longitudinal variations of the
late night-early morning drifts during June and December solstice are
anti-correlated. During geomagnetically active times, there are large
westward perturbation drifts in the late afternoon-early night sector at
upper middle latitudes, and in the midnight sector at low latitudes. The
largest westward disturbed drifts during equinox occur in European sector,
and the smallest in the Pacific region. These results suggest that during
equinox SAPS events occur most often at European longitudes. The low
latitude perturbation drifts do not show significant longitudinal |
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