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| Titel |
On the mechanism of the post-midnight winter NmF2 enhancements: dependence on solar activity |
| VerfasserIn |
A. V. Mikhailov, M. Forster, T. Y. Leschinskaya |
| 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. 11 ; Nr. 18, no. 11, S.1422-1434 |
| Datensatznummer |
250014091
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| Publikation (Nr.) |
 copernicus.org/angeo-18-1422-2000.pdf |
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| Zusammenfassung |
The mechanism of the NmF2
peak formation at different levels of solar activity is analyzed using Millstone
Hill IS radar observations. The hmF2 nighttime
increase due to thermospheric winds and the downward plasmaspheric fluxes are
the key processes responsible for the NmF2 peak
formation. The electron temperature follows with the opposite sign the electron
density variations in this process. This mechanism provides a consistency with
the Millstone Hill observations on the set of main parameters. The observed
decrease of the nighttime NmF2 peak amplitude with
solar activity is due to faster increasing of the recombination efficiency
compared to the plasmaspheric flux increase. The E×B plasma
drifts are shown to be inefficient for the NmF2
nighttime peak formation at high solar activity.
Key words: Ionosphere (ionosphere-atmosphere
interactions; mid-latitude ionosphere; plasma temperature and density) |
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