Astronomy and Astrophysics – Astrophysics
Scientific paper
2007-11-19
J.Phys.Conf.Ser.118:012086,2008
Astronomy and Astrophysics
Astrophysics
5 pages, Conference proceeding, HELAS II International Conference, August 20-24, 2007 Helioseismology, Asteroseismology and MH
Scientific paper
10.1088/1742-6596/118/1/012086
In order to take full advantage of the long time series collected by the GONG and MDI helioseismic projects, we present here an adaptation of the rotation-corrected $m$-averaged spectrum technique in order to observe low radial-order solar p modes. Modeled profiles of the solar rotation demonstrated the potential advantage of such a technique. Here we develop a new analysis procedure which finds the best estimates of the shift of each $m$ of a given ($n,\ell$) multiplet, commonly expressed as an expansion in a set of orthogonal polynomials, which yield the narrowest mode in the $m$-averaged spectrum. We apply the technique to the GONG data for modes with $1 \leq \ell \leq 25$ and show that it allows us to measure lower-frequency modes than with classic peak-fitting analysis of the individual-$m$ spectra.
Appourchaux Thierry
Leibacher John W.
Salabert David
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