A new estimate of the solar core rotation from IPHIR

Details A new estimate of the solar core rotation from IPHIR A new estimate of the solar core rotation from IPHIR

Apr 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994a%26a...284..265t&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 284, no. 1, p. 265-268

Astronomy and Astrophysics

Astrophysics

31

Solar Interior, Solar Oscillations, Solar Rotation, Angular Velocity, Eigenvectors, Equilibrium Equations, Legendre Functions, Photometers, Stellar Models

Scientific paper

The effect of a rigidly rotating core on frequency splitting is shown to be approximately the same for all the observed low-degree modes. It is suggested that, in analysing poorly resolved rotationally split multiplets in oscillation power spectra, one should first determine a single value for the splitting instead of estimating the splitting for individual modes separately. By using this technique for fitting lines with l = 1,2 of the IPHIR spectra, a mean sidereal splitting of 0.468 +/- 0.036 and of 0.427 +/- 0.046 micro-Hertz has been obtained for the green and red channels of the IPHIR photometer, respectively. The average value of these measurements, 0.452 +/- 0.020 micro-Hertz, suggests that the central core of the sun rotates with the same period of approximately 26 days as the outer part of the radiative zone.

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