A parametric model of the solar full-disk seismological signal

Solar eigenmodes frequencies are most often determined using some kind of modelisation of the Fourier power spectrum of the solar signal in one or two dimensions. Many statistical refinements have lead to significant improvements in the determination of the frequencies and widths of the spectral lines. Nevertheless, this technique relies strongly on several asumptions on the nature of the signal (damped oscillators) and of the resulting spectrum (Lorentz profiles). We present here a different method based on the parametric modeling of the solar signal, seen as an autoregressive (AR) process. A parametric modeling with model orders between 20 to 45 is performed on the filtered GOLF signal, on a per-mode basis. Preliminary tests show that for l = 0 modes the frequencies and widths from the parametric model are in good agreement (within the error-bars) of the 'classical' results.