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| Titel |
Morphology of NmF2 nighttime increases in the Eurasian sector |
| VerfasserIn |
A. V. Mikhailov, T. Yu. Leschinskaya, M. Forster |
| 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. 6 ; Nr. 18, no. 6, S.618-628 |
| Datensatznummer |
250014017
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| Publikation (Nr.) |
 copernicus.org/angeo-18-618-2000.pdf |
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| Zusammenfassung |
A statistical analysis of two peaks
(pre-midnight and post-midnight) occurrence in NmF2 daily variations was made on
a latitudinal chain of four ionosonde stations in the Eurasian longitudinal
sector. Overall 6182 cases of the first and 5600 cases of the second peak
occurrence were analyzed using all available foF2 observations for the
years of solar maximum and minimum. Well-pronounced and systematic variations
with season and solar activity were revealed in the occurrence probability of
the peaks, their amplitude and timing. The pattern of both peaks occurrence is
similar during winter and equinoxes for midlatitude stations implying one and
the same mechanism of their formation. The pre-midnight summer peak shows
specific variations in particular during solar maximum pointing to a different
mechanism controlling its appearance. Possible mechanisms of both peaks
formation are discussed.
Key words: Ionosphere (electric fields and currents;
ionosphere-magnetosphere interactions; mid-latitude ionosphere) |
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