Abstract
A study on the influence of solar activity and phases of equatorial quasi-biennial oscillation (QBO) on tropical rainfall over India has been made. The results of the total rainfall over the country indicate that during the period of low solar activity, excess/normal rainfall (frequent floods) are associated with the westerly phase of QBO and deficient/normal rainfall (frequent droughts) corresponded to the easterly phase. During the period ofhigh solar activity only normal rain is observed when QBO is in its westerly phase. Multiple regression analysis has employed to estimate the summer monsoon rainfall using sunspot number and equatorial zonal wind at 15-20 hPa during January February as independent parameters. A study on the spatial variability of monsoon rainfall in response to the solar activity and phases of QBO has also been attempted.
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