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Title: Study of Longperiod Global Oscillations of Sun Through Spherical Harmonic Fourier Analysis of Sunspot Activity
Authors: Gokhale, M. H
Keywords: Global Oscillations;Sunspots
Issue Date: 1988
Publisher: International Astronomical Union
Citation: IAU Symposium, No. 123, pp. 219 - 222
Abstract: A spherical harmonic Fourier analysis of the maximum areas of sunspot groups listed in Ledgers I and II of Greenwich photoheliographic results for 1933 - 1954 yield significant peaks at the 11 y periodicity for some spherical harmonic modes: especially the mode (l = 6, m = 0). A similar analysis of the daily areas of the spotgroups during 1944 - 1954 yields 11 y periodicity peaks only for some non-axisymmetric modes. These results suggest that the sunspot activity may be physically related to long period global oscillations of the sun.
ISSN: 0074-1809
Appears in Collections:IIAP Publications

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