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| Titel |
Seasonal variations of equatorial spread-F |
| VerfasserIn |
K. S. V. Subbarao, B. V. Krishna Murthy |
| 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 ; 12, no. 1 ; Nr. 12, no. 1, S.33-39 |
| Datensatznummer |
250010392
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| Publikation (Nr.) |
 copernicus.org/angeo-12-33-1994.pdf |
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| Zusammenfassung |
| The occurrence of spread-F at
Trivandrum (8.5°N, 77°E, dip 0.5°N) has been investigated on a seasonal basis
in sunspot maximum and minimum years in terms of the growth rate of
irregularities by the generalized collisional Rayleigh-Taylor (GRT) instability
mechanism which includes the gravitational and cross-field instability terms.
The occurrence statistics of spread-F at Trivandrum have been obtained
using quarter hourly ionograms. The nocturnal variations of the growth rate of
irregularities by the GRT mechanism have been estimated for different seasons in
sunspot maximum and minimum years at Trivandrum using h'F values and
vertical drift velocities obtained from ionograms. It is found that the seasonal
variation of spread-F occurrence at Trivandrum can, in general, be
accounted for on the basis of the GRT mechanism. |
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