A Parametric Model of the Solar Full-Disk Seismological Signal

Mouret, D.; Gelly, B.; Ferrari, A.; Pallé, P. L.; GOLF Team
Referencia bibliográfica

Structure and Dynamics of the Interior of the Sun and Sun-like Stars SOHO 6/GONG 98 Workshop Abstract, June 1-4, 1998, Boston, Massachusetts, p. 271

Fecha de publicación:
0
1998
Número de autores
5
Número de autores del IAC
1
Número de citas
1
Número de citas referidas
1
Descripción
Solar eigenmodes frequencies are most often determined using some kind of modelisation of the Fourier spectrum of the data 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 of 2nd order. A parametric modeling with model orders between 20 to 35 is performed on the filtered GOLF signal, on a per-mode basis. Preliminary tests show that for ell = 0 modes the frequencies and widths from the parametric model are in good agreement (within the error-bars) of the 'classical' published results. A more complete evaluation is now ongoing and we will be presenting a first evaluation of the potential of this new signal analysis.