Bibcode
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 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.