Abstract
Abstract. The records of VLF atmospherics over Calcutta and then over Kalyani (West Bengal) during the torrential rainfall, caused by violent monsoon and post-monsoon depressions, exhibit distinct long-period fadings both at day and night. Interesting results obtained from an analysis of round-the-clock atmospherics data and associated meteorological parameters are reported in this paper. A possible correlation between the severe meteorological activity with the solar geophysical phenomena was studied. The results are indicative of an interesting sequence of solar-terrestrial events. A tentative conclusion is reached, suggesting an origin of the fading from atmospheric gravity waves generated in the centre of activity of the depressions concerned.Key words. Meteorology and atmospheric dynamics · Lightning · Precipitation
Highlights
The study of monsoon activity including post-monsoon behaviour in the tropical region has been a subject of great interest in recent years
It is well known that the solar energy reaching the earth and its atmosphere is the prime source of meteorological activity
From the nature of the association it appears that a systematic coordinated measurement of the solar geophysical and meteorological parameters on a worldwide basis (Williams et al, 1989) would be very informative in unravelling the intricate nature of solar-terrestrial relationships responsible for these havocs and could eventually help to formulate a kind of precursor to predict such events
Summary
The study of monsoon activity including post-monsoon behaviour in the tropical region has been a subject of great interest in recent years. During the south-west monsoon season (June to September) the rainfall over large parts of Indiauctuates between epochs of heavy and light rainfall. A period of heavy rainfall is usually known as active monsoon, and one of light rainfall as weak monsoon (Bhattacharya et al, 1995). It is well known that the solar energy reaching the earth and its atmosphere is the prime source of meteorological activity. This paper basically deals with some solar-meteorological-geomagnetic relationships. It covers two complementary but independent aspects. It is a report on observations of fadings in the level of VLF electromagnetic waves observed in relation with severe meteorological storms, while the second aspect concerns a hypothetical relationship between the solargeomagnetic perturbations and the occurrence of these severe storms
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