Abstract
Solar and magnetic activity effects on VHF night-time ionospheric scintillations recorded during three and half year at Bhopal, a station near the northern crest of the equatorial anomaly in the Indian region have been presented. The night time diurnal scintillation occurrence decreases with decrease in solar activity. Monthly mean scintillation occurrence changes according to solar activity during E- and D- months but not so during J-months. The magnetic activity shows seasonal effect on scintillations and, in general, inhibits the scintillation occurrence in pre-midnight period and enhances little in post-midnight period especially after 03h IST. For most of the severe magnetic storms in which D st goes below −125 nT and recovery phase starts in post-midnight — dawn local time sector, strong post-midnight scintillations which sometimes extend for several hours beyond the local sunrise, are observed.
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