Physics
Scientific paper
Dec 1963
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1963jatp...25..721r&link_type=abstract
Journal of Atmospheric and Terrestrial Physics, vol. 25, no. 12, pp. 721-731
Physics
2
Scientific paper
Data from seven stations ranging in magnetic dip from 0° to 44°N have been analysed to study night time and seasonal variations of spread-F through nearly half a solar cycle. It is observed that the inhibition of spread-F due to geomagnetic activity is maximum in the equinoxes. In the belt of magnetic dip 0° to 10° a second peak in the occurrence of spread-F is observed during the night hours. At a typical equatorial station, the occurrence of spread-F is observed to increase with sunspot number. A similar variation is observed in h'F also. At stations with magnetic dip [greater-or-equal, slanted] 18°, the occurrence of spread-F increases with sunspot number in equinoxes but decreases with sunspot number in summer. A significant lunar variation is observed in the occurrence of equatorial spread-F which suggests that electrodynamic drift plays a major role in the occurrence of equatorial spread-F.
Kapasi K. B.
Rangaswamy S.
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