Seasonal variations of equatorial spread-F

Details Seasonal variations of equatorial spread-F Seasonal variations of equatorial spread-F

Feb 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994angeo..12...33s&link_type=abstract

Annales Geophysicae: Atmospheres, Hydrospheres and Space Sciences (ISSN 0992-7689), vol. 12, no. 1, p. 33-39

Statistics

13

Annual Variations, Equatorial Atmosphere, Solar Activity Effects, Spread F, Taylor Instability, Collisional Plasmas, Geomagnetism, Ionospheric Disturbances, Sunspot Cycle

Scientific paper

The occurrence of spread-F at Trivandrum (8.5 deg N, 77 deg E, dip 0.5 deg 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 crossfield 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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