Hostname: page-component-7479d7b7d-t6hkb Total loading time: 0 Render date: 2024-07-11T12:15:42.607Z Has data issue: false hasContentIssue false
  • English
  • Français

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

Core share and HTML view are not available for this content. However, as you have access to this content, a full PDF is available via the ‘Save PDF’ action button.

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

Gokhale, M.H.: 1986, J. Astrophys. & Astron. (in press).Google Scholar
Howard, R. and Labonte, B.: 1980, Astrophy. J (Lett.) 239, L33.CrossRefGoogle Scholar
Stenflo, J.O. and Vogel, M.: 1986, Nature 319, 285.Google Scholar