Solar cycle induced variations of the low L solar acoustic spectrum

Details Solar cycle induced variations of the low L solar acoustic spectrum Solar cycle induced variations of the low L solar acoustic spectrum

Oct 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989a%26a...224..253p&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 224, no. 1-2, Oct. 1989, p. 253-258. Research supported by CICYT.

Astronomy and Astrophysics

Astrophysics

57

Acoustic Frequencies, Helioseismology, Solar Cycles, Solar Oscillations, Solar Spectra, Center Of Gravity, Cross Correlation, Frequency Shift, Power Spectra

Scientific paper

Doppler velocity data are used to study solar cycle variation of the frequencies of solar acoustic oscillations from 1977 to 1988. The results show a clear shift in frequency of the cross-correlation peaks of -0.37 + or - 0.04 microHz peak to peak as the solar activity cycle progresses from maximum to minimum. This effect is dependent on the l value of the modes. The results suggest that, as low l modes penetrate deeply into the sun's interior, there are structural changes correlated with the solar activity cycle.

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