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 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.
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References
Gokhale, M.H.: 1986, J.Astrophys. amp Astron. (in press).
Howard, R. and Labonte, B.: 1980, Astrophy. J (Lett.) 239, L33.
Stenflo, J.O. and Vogel, M.: 1986, Nature 319, 285.
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© 1988 International Astronomical Union
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Gokhale, M.H. (1988). Study of Long Period Global Oscillations of Sun Through Spherical Harmonic Fourier Analysis of Sunspot Activity. In: Christensen-Dalsgaard, J., Frandsen, S. (eds) Advances in Helio- and Asteroseismology. International Astronomical Union / Union Astronomique Internationale, vol 123. Springer, Dordrecht. https://doi.org/10.1007/978-94-009-4009-3_49
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DOI: https://doi.org/10.1007/978-94-009-4009-3_49
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