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Astron. Astrophys. 330, 336-340 (1998)

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Estimate of solar radius from f-mode frequencies

H.M. Antia

Tata Institute of Fundamental Research, Homi Bhabha Road, Mumbai 400 005, India

Received 16 June 1997 / Accepted 24 September 1997

Abstract

Frequency and rotational splittings of the solar f-modes are estimated from the GONG data. Contrary to earlier observations the frequencies of f-modes are found to be close to the theoretically computed values for a standard solar model. The f-mode being essentially a surface mode is a valuable diagnostic probe of the properties of the solar surface, and also provides an independent measure of solar radius. The estimated solar radius is found to be about 0.03% less than what is traditionally used in construction of standard solar models. If this decrease in solar radius is confirmed then the current solar models as well as inversion results will need to be revised. The rotational splittings of the f-modes yield an independent measure of the rotation rate near the solar surface, which is compared with other measurements.

Key words: Sun: oscillations – Sun: rotation

Send offprint requests to: H. M. Antia

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© European Southern Observatory (ESO) 1998

Online publication: January 8, 1998
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