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| Titel |
Post midnight spread-F occurrence over Waltair (17.7° N, 83.3° E) during low and ascending phases of solar activity |
| VerfasserIn |
K. Niranjan, P. S. Brahmanandam, P. Ramakrishna Rao, G. Uma, D. S. V. V. D. Prasad, P. V. S. Rama Rao |
| 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 ; 21, no. 3 ; Nr. 21, no. 3, S.745-750 |
| Datensatznummer |
250014591
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| Publikation (Nr.) |
 copernicus.org/angeo-21-745-2003.pdf |
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| Zusammenfassung |
A study carried out on
the occurrence of post midnight spread-F events at a low-latitude station,
Waltair (17.7° N, 83.3° E), India revealed that its occurrence is maximum in
the summer solstice months of the low solar activity period and decreases with
an increase in the sunspot activity. The F-region virtual height variations
show that 80% of these spread-F cases are associated with an increase in the
F-region altitude. It is suggested with the support of the night airglow 6300 A
zenith intensity data obtained with co-located ground-based night airglow
photometer and electron temperature data from the Indian SROSS C2 satellite
that the seasonal variation of the occurrence and probable onset times of the
post midnight spread-F depend on the characteristics of the highly variable
semipermanent equatorial Midnight Temperature Maximum (MTM).
Key words. Ionosphere (ionospheric
irregularities; ionosphere atmosphere interactions) Atmospheric composition and
structure (airglow and Aurora) |
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