Analysis of Ca(+) K plage area for short period variation

Details Analysis of Ca(+) K plage area for short period variation Analysis of Ca(+) K plage area for short period variation

Dec 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989japa...10..381s&link_type=abstract

Journal of Astrophysics and Astronomy (ISSN 0250-6335), vol. 10, Dec. 1989, p. 381-389.

Astronomy and Astrophysics

Astrophysics

Calcium, Faculae, Power Spectra, Sunspot Cycle, Twenty-Seven Day Variation, Autocorrelation, Fast Fourier Transformations, Solar Rotation, Spectrum Analysis

Scientific paper

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.

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