Volume 394, Number 1, October IV 2002
|Page(s)||285 - 297|
|Section||Planets and planetary systems|
|Published online||04 October 2002|
Solar -modes from 1979 days of the GOLF experiment
Laboratoire d'Astrophysique, UMR 6525 du CNRS, Université de Nice-Sophia Antipolis, 06108 Nice Cedex 2, France
2 C.N.R., 52 Charii Omar Ibn El Khattab, BP 8027, Rabat, Morocco
3 Département Cassini, UMR 6529 du CNRS, Observatoire de la Côte d'Azur, 06304 Nice, France
4 Laboratoire de Physique des Hautes Énergies et Astrophysique, Université Cadi Ayyad, Marrakech, Morocco
Corresponding author: B. Gelly, firstname.lastname@example.org
Accepted: 10 July 2002
With the GOLF instrument onboard the SoHO observatory, 1979 days of full-disc Doppler velocity observations have been compiled into a study of p-mode properties. We develop a multi-step iterative method (MSIM) algorithm to access all p-mode parameters while minimizing any perturbating effect or cross-talk between parameters during their determination. We present frequency and splitting tables, amplitudes, linewidths, line asymmetries, pseudo-modes, and background noise determinations. We have a first look at the changes induced by the transition from the low-activity to the high-activity part of solar cycle 23: we have recorded frequency shifts with a downturn at 3.7 mHz followed by a possible higher upturn, and linewidth changes to a good accuracy. We detect an effect on the noise background at 3 mHz possibly related to an interaction between noise and the modes and connected to the asymmetry of the profiles.
Key words: Sun: oscillations / Sun: helioseismology
© ESO, 2002
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