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The solar cycle and Indian rainfall

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The objective of this study is to examine critically the relationship between solar cycles and Indian monsoon rainfall, for the period 1871–1984, and to search for significant periodicities, by utilizing the maximum entropy spectral technique (MEST). The results of this study using MEST show clearly a significant 11-year cycle in solar activity and rainfall. Also present is a significant 7.33-year cycle in rainfall. The double (Hale) sunspot cycle is not discernible here either in sunspot number or in rainfall. The cross-spectral analysis between the sunspot number and rainfall confirms the existence of a reasonable correlation over an 11-year cycle with a relative phase lag of 0.16 year (sun lead).


Zweck dieser Studie ist die kritische Überprüfung des Zusammenhangs zwischen Sonnenzyklus und dem indischen Monsunregen im Zeitraum 1871–1984 und die Festlegung spezifischer Periodizitäten mittels der Maximal-Entropie-Analyse (MEST). Die Resultate zeigen einen signifikanten 7,33-jährigen Niederschlagszyklus. Der doppelte (Hale) Sonnenfleckenzyklus ist hierbei nicht ausnehmbar, weder bei der Anzahl der Sonnenflecken, noch beim Niederschlag. Die Kreuz-Spektralanalyse zwischen Sonnenfleckenzyklus und Niederschlag bestätigt die Existenz einer Korrelation über einen 11jährigen Zyklus mit einer relativen Phasenverzögerung von 0,16 Jahren.

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On leave from the Indian Institute of Tropical Meteorology, Pune, India.

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Reddy, R.S., Neralla, V.R. & Godson, W.L. The solar cycle and Indian rainfall. Theor Appl Climatol 39, 194–198 (1989). https://doi.org/10.1007/BF00867947

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  • Solar Activity
  • Solar Cycle
  • Monsoon Rainfall
  • Sunspot Number
  • Indian Monsoon