Astronomy and Astrophysics – Astrophysics
Scientific paper
Oct 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004kfnt...20..408k&link_type=abstract
Kinematika i Fizika Nebesnykh Tel, vol. 20, no. 5, p. 408-415
Astronomy and Astrophysics
Astrophysics
Scientific paper
Regular measurements of oscillations of the Sun-as-a-star's photosphere have been performed at the Crimean Astrophysical Observatory since 1974. In this experiment, a Babcock solar magnetograph detects Doppler effect difference between the central part and the limb part of the solar disk (using the Fraunhofer absorption line Fe I λ 512.4 nm). Over last 30 years the measurements were made during 1807 days (in aggregate more than 11 thousand hours). The most significant peak of the power spectrum of the line-of-sight velocity variations corresponds to the period P = 159.9655±0.0005 min. The period is in good agreement, within the error limit, with the Stanford value 159.9663±0.0008 min, inferred before from the independent 1977-1994 measurements, which supports strongly solar origin of the period. This oscillation has nearly constant initial phase over the total 30-year interval and reveals substantially non-harmonic mean profiles of both, velocity and radius, perturbations. The true physical nature of the P phenomenon and the source of its excitation are unknown. It is supposed that the periodic oscillation of the Sun's photosphere is caused by superfast rotation of the central solar core.
Haneychuk V. I.
Kotov Valerii A.
Tsap T. T.
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