Long period oscillations in solar diameter measurements

Details Long period oscillations in solar diameter measurements Long period oscillations in solar diameter measurements

Oct 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985natur.317..416d&link_type=abstract

Nature (ISSN 0028-0836), vol. 317, Oct. 3, 1985, p. 416-418.

Astronomy and Astrophysics

Astronomy

89

Astrometry, Solar Diameter, Solar Oscillations, Astrolabes, Periodic Variations, Power Spectra, Solar Activity

Scientific paper

Observations of the sun with a Danjon-type visual astrolabe, recorded since 1975 at the CERGA Observatory, provide good quality, homogeneous values of the solar diameter. The existence of a long period of about 1000 days in the variation of that diameter was reported by Laclare (1983). Here, a low-frequency domain of the power spectrum is analyzed based on recent data. Several previously undetected periodicities are revealed, including long-period oscillations of characteristic amplitude 0.1 arcsec. The physical origin of these variations is found in deep layers of the solar body, possibly in the core for the 1000 days oscillation.

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