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| Titel |
Spectral energy contributions of quasi-periodic oscillations (2-35 days) to the variability of the foF2 |
| VerfasserIn |
E. M. Apostolov, D. Altadill, R. Hanbaba |
| 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 ; 16, no. 2 ; Nr. 16, no. 2, S.168-175 |
| Datensatznummer |
250013153
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| Publikation (Nr.) |
 copernicus.org/angeo-16-168-1998.pdf |
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| Zusammenfassung |
The relative contributions of quasi-periodic
oscillations from 2 to 35 days to the variability of foF2 at
middle northern latitudes between 42°N and 60°N are investigated. The foF2
hourly data for the whole solar cycle 21 (1976–1986) for four European
ionospheric stations Rome (41.9°N, 12.5°E), Poitiers (46.5°N, 0.3°E),
Kaliningrad (54.7°N, 20.6°E) and Uppsala (59.8°N, 17.6°E) are used for
analysis. The relative contributions of different periodic bands due to
planetary wave activity and solar flux variations are evaluated by integrated
percent contributions of spectral energy for these bands. The observations
suggest that a clearly expressed seasonal variation of percent contributions
exists with maximum at summer solstice and minimum at winter solstice for all
periodic bands. The contributions for summer increase when the latitude
increases. The contributions are modulated by the solar cycle and simultaneously
influenced by the long-term geomagnetic activity variations. The greater
percentage of spectral energy between 2 to 35 days is contributed by the
periodic bands related to the middle atmosphere planetary wave activity.
Key words. Ionosphere · Ionosphere-atmosphere
interactions · Mid-latitude ionosphere · Plasma waves and instabilities |
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