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| Titel |
The correlation of longitudinal/seasonal variations of evening equatorial pre-reversal drift and of plasma bubbles |
| VerfasserIn |
G. Li, B. Ning, L. Liu, Z. Ren, J. Lei, S.-Y. Su |
| 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.2571-2578 |
| Datensatznummer |
250015963
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| Publikation (Nr.) |
 copernicus.org/angeo-25-2571-2007.pdf |
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| Zusammenfassung |
| The evening pre-reversal vertical drift velocity
enhancement (PRE) constitutes an important seeding mechanism for the
generation of F region irregularities. Ion density and drift measurements
from ROCSAT-1 and DMSP satellites are used to examine the correlation of
longitudinal/seasonal (l/s) variations in the evening pre-reversal vertical
drift velocity at the magnetic equator in the topside ionosphere and the
plasma bubble (PB) occurrence probability. The analysis performed for three
years 2000–2002 (solar maximum), provides consistent evidence as the ground
observations that the equatorial PB occurrence is dependent on and increases
approximately linearly with PRE, and the l/s variations of PRE play an
important role in the global l/s distribution of PB occurrence. The
solstitial evening PRE and equatorial PB occurrence show similar
longitudinal variations: During June solstice, two peaks appear in the
African and Pacific longitude sectors, and two minimums are observed in the
Indian and American regions; During December solstice, the situation is
approximately opposite. The equinoctial longitudinal effects are comparably
small. It is concluded that the large-scale l/s variations of equatorial PB
occurrence can be closely related to the l/s variations of PRE. |
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