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GEOPHYSICAL RESEARCH LETTERS,
VOL. 32,
L05813,
doi:10.1029/2004GL021044,
2005
Possible association between Indian monsoon rainfall and solar activity
S. Bhattacharyya
Jawaharlal Nehru Centre For Advanced Scientific Research, Jakkur, Bangalore, India
R. Narasimha
Jawaharlal Nehru Centre For Advanced Scientific Research, Jakkur, Bangalore, India
Abstract
Over the 120 y period (1871–1990) for which reliable Indian rainfall statistics are available, solar activity parameters exhibit
nonstationarity. Taking this fact into account, we present here the results of an analysis of four solar activity indices
and seven major Indian monsoon rainfall time series, over two distinct test periods respectively of low and high solar activity,
each comprising three complete solar cycles. It is found that the average rainfall is higher in all seven rainfall indices
during periods of greater solar activity, at confidence levels varying from 75% to 99%, being 95% or greater in three of them.
Using wavelet techniques it is also found that the power in the 8–16 y band during the period of higher solar activity is
higher in 6 of the 7 rainfall time series, at confidence levels exceeding 99.99%. These results support existence of connections
between Indian rainfall and solar activity.
Received 19
July
2004;
accepted 18
January
2005;
published 11
March
2005.
Index Terms: 1650 Global Change: Solar variability (7537); 7536 Solar Physics, Astrophysics, and Astronomy: Solar activity cycle (2162); 1704 History of Geophysics: Atmospheric sciences; 1620 Global Change: Climate dynamics (0429, 3309); 1616 Global Change: Climate variability (1635, 3305, 3309, 4215, 4513).
Read Full Article (file size: 247911 bytes) Cited by
Citation: Bhattacharyya, S., and R. Narasimha
(2005),
Possible association between Indian monsoon rainfall and solar activity,
Geophys. Res. Lett.,
32,
L05813,
doi:10.1029/2004GL021044.
Copyright 2005 by the American Geophysical Union.
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