Has rapid solar core rotation been observed?

Details Has rapid solar core rotation been observed? Has rapid solar core rotation been observed?

Apr 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983natur.302..808a&link_type=abstract

Nature (ISSN 0028-0836), vol. 302, April 28, 1983, p. 809, 810.

Physics

14

Solar Rotation, Solar Spectra, Stellar Structure, Sunspots, Cores, Gravitation Theory, Limb Darkening, Line Spectra, Quadrupoles, Solar Physics

Scientific paper

It is shown that the phase as well as the magnitude of the observed signal amplitude of the solar rotational velocity signal may be predicted without any rapid core rotation by taking into account the presence of sunspots and their contribution to the spectral line profile as integrated over the disk of the sun. The expected line profile for the whole sun was calculated by adding the contribution to the line profile from each part of the visible hemisphere. The determination of the sunspot line profile is discussed. The calculated velocity signal as caused by the passage of sunspots over the solar disk is plotted against the time and shown. It is concluded that the existence of a 13.1-day apparently periodic velocity signal with amplitude 6.5 m/s during the 88-day observing period cannot be taken as evidence for a rapidly rotating solar core.

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