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In order to take full advantage of the long time series collected by the GONGand MDI helioseismic projects, we present here an adaptation of therotation-corrected $m$-averaged spectrum technique in order to observe lowradial-order solar p modes. Modeled profiles of the solar rotation demonstratedthe potential advantage of such a technique. Here we develop a new analysisprocedure 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 orthogonalpolynomials, which yield the narrowest mode in the $m$-averaged spectrum. Weapply the technique to the GONG data for modes with $1 \leq \ell \leq 25$ andshow that it allows us to measure lower-frequency modes than with classicpeak-fitting analysis of the individual-$m$ spectra.

Development of a new analysis technique to measure low radial-order p modes in spatially-resolved helioseismic data