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| Titel |
The dependence of plasma density in the topside ionosphere on the solar activity level |
| VerfasserIn |
L. Liu, W. Wan, X. Yue, B. Zhao, B. Ning, M.-L. Zhang |
| 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. 6 ; Nr. 25, no. 6 (2007-06-29), S.1337-1343 |
| Datensatznummer |
250015862
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| Publikation (Nr.) |
 copernicus.org/angeo-25-1337-2007.pdf |
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| Zusammenfassung |
| In this paper, the ten-year (1996–2005) total ion density Ni
measurements from the Defense Meteorological Satellite Program (DMSP)
spacecraft in the morning and evening (09:30 and 21:30 LT) sectors have been
analyzed to explore the dependence of plasma densities in the topside
ionosphere at middle and low latitudes on the solar activity level. Results
indicate that there is a strong solar activity dependence of DMSP Ni at
848 km altitude, which has latitudinal and seasonal features. The plasma
density in the topside ionosphere has an approximately linear dependence on
daily F107 and a strongly nonlinear dependence on SEM/SOHO EUV, such that
the change rate of Ni becomes greater with increasing solar EUV. This is
quite different from the dependence of Ni near the F-Region peak
(NmF2), at which the rate of change of NmF2 decreases with
increasing solar EUV. The rate of change of Ni at the DMSP altitude is
greatest in the latitude range where Ni is greatest during high solar
activity. We suggest that this greater rate of change (or amplification
effect) of Ni at the DMSP altitude is mainly a consequence of the solar
activity variations of the topside scale height. The changes in the height
of the F-Region peak (hmF2) and the density NmF2 play
a secondary role. |
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