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| Titel |
Letter to the Editor: Spatial and seasonal variations of the foF2 long-term trends |
| VerfasserIn |
A. D. Danilov, A. V. Mikhailov |
| 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 ; 17, no. 9 ; Nr. 17, no. 9, S.1239-1243 |
| Datensatznummer |
250013817
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| Publikation (Nr.) |
 copernicus.org/angeo-17-1239-1999.pdf |
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| Zusammenfassung |
Using a method suggested by the authors
earlier, the long-term trends of the F2-layer critical frequency, foF2
are derived for a set of ionospheric stations with a wide latitudinal and
longitudinal coverage. All the trends are found to be negative. A pronounced
dependence on geomagnetic latitude is found, the trend magnitude increasing with
the latter. No globe scale longitudinal effect in trends is detected. For the
majority of the stations there is also a pronounced seasonal effect, the trend
magnitude being higher in summer than in winter.
Key words. Ionosphere (ionospheric disturbances;
mid-latitude ionosphere) |
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