Appearance of solar activity signals in Indian Ocean

Appearance of solar activity signals in Indian Ocean
Dipole (IOD) phenomena and monsoon climate
pattern over Indonesia

Jalu Tejo Nugroho¤
National Institute of Aeronautics and Space (LAPAN), Indonesia

Abstract. From previous studies, it is known that interaction between ocean – atmosphere causes climate variability in the tropical Indian Ocean region as well
as in Indonesia. It has also been proposed that solar activity affects Earth’s
climate globally and regionally. In this study, we report association between
Indian Ocean Dipole (IOD) phenomena and cloud cover over western Indonesia.
The statistical correlation coeficient(r) is found to be 0.64, for the period April
1976 to January 1996. By using wavelet analysis, we also find that solar signal
appears strongly on IOD during December-February.

Keywords : wavelet analysis, Solar activity, IOD

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