Abstract
AbstractThe 115 year (1871–1985) long, summer monsoonal rainfall data of ten macroregions (m‐r) of India have been subjected to maximum entropy spectral analysis (MESA). The results appear to indicate quasi‐periodic fluctuations in rainfall in eight and six m‐r, presumably corresponding to the 18.6–year luni‐solar nodal and 10–11‐year solar cycles respectively. The solar term in the remaining four m‐r appears to be split up into two components, as a result of spectral analysis. The filtered data, evidencing either or both of the signals in MESA, were then subjected to two band‐pass filters, centred at 19.0 and 10.5 years respectively. The derived rainfall waveforms are found to have some good phase relationships with the 18.6–year nodal and 10–11‐year solar cycles, when relatively free from meteorological disturbances. The luni‐solar rainfall waveforms in m‐r 2, 3 and 7 exhibit the phenomenon of a sudden 180° phase change in the early parts of the data series.
Published Version
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