STUDY OF SCINTILLATIONS OBSERVED AT DELHI DURING HIGH SOLAR-ACTIVITY PERIOD

Diurnal and seasonal variations in the occurrence of both daytime and nighttime scintillations observed at Delhi during high solar activity period of 1979-80 are described. The occurrence of daytime scintillati ons is maximum in summer and minimum in winter months. They peak aroun d midday and show negative correlation with solar activity. The nightt ime scintillations are of two types, viz. class I (with fading rate mo re than 6 per min) and class II (with fading rate less than 6 per min) . Class I type scintillations show maximum occurrence in equinox and c lass II in summer. The nighttime class I type scintillations show posi tive correlation with solar activity, while class II type show negativ e correlation.