Other
Scientific paper
Jan 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984natur.307..247s&link_type=abstract
Nature (ISSN 0028-0836), vol. 307, Jan. 19, 1984, p. 247-249.
Other
16
Power Spectra, Secular Variations, Solar Oscillations, Solar Spectra, Magnetic Signatures, Resonance, Solar Atmosphere
Scientific paper
The results of solar oscillation observations carried out between 1974 and 1982 using the Crimean solar magnetograph are reported. All peaks of telluric origin were eliminated from the mean power spectrum; of the remaining 32 dominant peaks, 19 are of solar origin and 13 are partly blended with the atmospheric peaks. Ten solar peaks are in very good agreement with the g(10)-g(20) modes of degree 1 = 4 calculated by Christensen-Dalsgaard et al. (1979) for the solar model C with the envelope enriched in heavy elements by accretion. Deviations of the observed long-period oscillations from linearity can be appreciable, leading to the appearance of combination frequencies. The dominant 160-min peak seems to be excited by a strong 'double' resonance of 2g(8) mode of model C with a combination frequency and two other combination frequencies of modes 1g(1) and 2f including the unstable mode l = 1.
Kotov Valerii A.
Severnyi A. B.
Tsap T. T.
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