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Study of long period global oscillations of Sun through spherical harmonic Fourier analysis of sunspot activity

Published online by Cambridge University Press:  03 August 2017

M.H. Gokhale
M.H. Gokhale*
Affiliation:
Indian Institute of Astrophysics, Bangalore 560034 India

Abstract

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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 11y 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 11y 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.

Type
Chapter 3: Longterm Variations in the Sun
Information
Symposium - International Astronomical Union , Volume 123: Advances In Hello- and Asteroseismology , 1988 , pp. 219 - 222
Copyright
Copyright © Reidel 1988 

References

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