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Title: Analysis of Ca(+) K plage area for short period variation
Authors: Singh, J
Jain, S. K
Keywords: Calcium;Faculae;Power spectra;Sunspot cycle;Twenty-seven day variation;Autocorrelation;Fast fourier transformations;Solar rotation;Spectrum analysis
Issue Date: Dec-1989
Publisher: Indian Academy of Sciences
Citation: Journal of Astrophysics and Astronomy , Vol. 10, No. 4, pp. 381 - 389
Abstract: Observations of solar Ca(+) K daily plage area from 1951 to 1977 are analyzed to search for short-period (12-13 day) variations. The 27-day periodicity due to solar rotation modulation is found at all latitudes. Using an autocorrelation technique a 12-13 day periodicity is found only in three of the 57 data sets examined. However, a weak peak around 12-13 days is found in the power spectrum of all of the data sets. It is suggested that two distinct active longitudes separated by about 140-170 degrees are the cause of the 12-13 day periodicity in the autocorrelation.
ISSN: 0250-6335
Appears in Collections:IIAP Publications

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