Global oscillations of the Sun - Observed as oscillations in the apparent solar limb darkening function

Details Global oscillations of the Sun - Observed as oscillations in the apparent solar limb darkening function Global oscillations of the Sun - Observed as oscillations in the apparent solar limb darkening function

Feb 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979mnras.186..327h&link_type=abstract

Monthly Notices of the Royal Astronomical Society, vol. 186, Feb. 1979, p. 327-342. NSF-USAF-supported research.

Astronomy and Astrophysics

Astronomy

26

Astrometry, Limb Darkening, Solar Oblateness, Solar Oscillations, Photosphere, Power Spectra, Solar Gravitation, Stellar Models, Vibration Mode

Scientific paper

Solar oblateness observations made on seven days in September 1973 are analyzed. Power spectra are obtained for four solar-diameter measurements, and both power spectra and phase information are extracted from Fourier transforms of the data sets. Significant peaks are found in the averaged power spectrum at 0.25, 0.37, 0.41, 0.46, 0.54, and 0.61 mHz. Further analysis of the properties of these peaks reveals an impressive degree of phase coherency. It is proven that a significant fraction of the oscillatory power is produced by fluctuating changes in the apparent limb-darkening function. Possible nonsolar and solar mechanisms for producing effective fluctuating changes in the apparent limb-darkening function are considered. It is concluded that the detected oscillations are statistically significant, that a significant fraction of the oscillatory power is solar in origin, and that the oscillations are eigenmodes of the sun.

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