Astronomy and Astrophysics – Astronomy
Scientific paper
Apr 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995mnras.273..573g&link_type=abstract
Monthly Notices of the Royal Astronomical Society, Volume 273, Issue 3, pp. 573-582.
Astronomy and Astrophysics
Astronomy
24
Sun: Interior, Sun: Oscillations
Scientific paper
Partial reflection of acoustic waves by regions of rapid spatial variation modulates the solar p-mode frequencies, in a manner that is often described in terms of an acoustic phase alpha. At low degree, alpha is a function of frequency alone. At higher degrees, the inclination of the acoustic ray paths from the normal to the reflecting layers becomes significant, and gives rise to a degree dependence. With the current accuracy of frequency measurements, this phenomenon is significant for all the p modes trapped in the convection zone. We describe a technique capable of separating the degree-dependent component from the leading term alpha_0(omega). We determine the leading-order contribution to the degree dependence of alpha from the solar p-mode frequencies reported by Libbrecht, Woodard & Kaufman, and compare the results with direct computations from a solar model based on the formalism described by Brodsky & Vorontsov. The dominant contribution comes from the second helium ionization zone, and can be used as a new source of information relevant to the helioseismic calibration of the equation of state of the solar plasma and to the determination of the solar helium abundance.
Gough Douglas O.
Vorontsov Sergei V.
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