Some indications of 18·6 year LUNI‐Solar and 10–11 year solar cycles in rainfall in North‐West India, the plains of Uttar Pradesh and North‐Central India
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Media type:
E-Article
Title:
Some indications of 18·6 year LUNI‐Solar and 10–11 year solar cycles in rainfall in North‐West India, the plains of Uttar Pradesh and North‐Central India
Contributor:
Mitra, Kumares;
Mukherji, Subhasish;
Dutta, S. N.
Description:
<jats:title>Abstract</jats:title><jats:p>Rainfall data available in the form of books published by the India Meteorological Department for 115 rain‐gauge stations in north‐west India, the Plains of Uttar Pradesh, and north‐central India for the period 1901–1950 have been subjected to maximum entropy spectral analysis (MESA). The results of the analysis indicate that 91 out of 115 rain‐gauge stations appear to respond to 18·6‐year luni‐solar nodal (M<jats:sub>N</jats:sub>) signal. The statistical average value of the signal periodicity (<jats:italic>T̄</jats:italic><jats:sub>L</jats:sub>) in rainfall proves to be 18·3 + 1·6 years.</jats:p><jats:p>Maximum entropy spectral analysis results also appear to indicate the existence of a 10–11‐year solar cycle (S<jats:sub>c</jats:sub>) in 77 rain‐gauge stations out of 115. Application of MESA apparently splits the solar signal term, resulting in its absence from the spectral results of some stations and the presence of an 8–9‐year component in almost every station result. The statistical average value of the solar signal periodicity (<jats:italic>T̄</jats:italic><jats:sub>S</jats:sub>) in rainfall proves to be 10·9±0·7 years.</jats:p>