Influence of solar activities on the cyclonic disturbances over Indian seas
The characteristics of the distribution of the annual number of cyclonic disturbances (C) over Indian seas (the Bay of Bengal and the Arabian Sea including a few formed over land) daring the period 1891 to 1985 and its variation with solar activity, estimated in terms of annual mean sunspot number (S), has been studied. The variation of cyclonic disturbances with the duration of year solar cycle and the sun spot numbers indicate (i) a decrease in the average value of C with simultaneous In S from the middle of the decade, 1940-50, and (ii) a negative association between C and S for large value of the latter. A critical value of Sin the neighbourhood of 85 has also been found exceeding to which this association becomes prominent (correlation coefficient= -0, 54, significant at 1% level).
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