Other
Scientific paper
Nov 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981stin...8233314k&link_type=abstract
Unknown
Other
Sunspot Cycle, Sunspots, Least Squares Method, Linear Prediction, Power Spectra, Spectrum Analysis
Scientific paper
The annual mean sunspot numbers during 1749 to 1971 are subjected to power spectrum anaysis by the recentmost least-squares linear prediction method evolved by Barrodale and Erickson. For the two consecutive intervals 1749 to 1844 and 1845 to 1971, only one major peak at T = 9.7 yr is common and many other peaks are different, indicating either unreliability of the earlier data, or a possibility that the two samples do not belong to the same population. In general, peaks near T = 5 yr have only border-line significance, peaks near T = 11 yr are highly significant and multiple and probably change with time. In the large periodicity region peaks definitely exist for T = 60 to 100 yr range, but probably change with time. Attempt at prediction of future activity yielded a number less than 100 for cycle 21; much lesser than the observed value of 155 in 1979 to 1980.
Kane Rajaram Purushottam
Trivedi Nalin Babulal
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