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The acoustic low-degree eigenfrequencies of the Sun measured with 14 years of continuous GOLF velocity measurements

Auteur

Garcia Rafael A.

Institution

Service d'Astrophysique, CEA/Sacaly

Theme

Low degree solar and stellar seismology
Auteur(s) supplémentaire(s)D. Salabert, J. Ballot, K. Sato and S. Mathur
Institution(s) supplémentaire(s)IAC, LATT, HAO

Abstract

The helioseismic Global Oscillation at Low Frequency (GOLF) instrument on board SoHO, has been observing the Sun continuously for the last 14 years. In this work we characterize the acoustic modes over the entire p-mode range up to ~3.5 mHz with a special care for the low-frequency modes taking advantage of the stability and the high duty cycle (>94%) of space observations. Reference p-mode parameters, at low activity level, have been obtained by simultaneously fitting one-year subseries letting every mode parameter vary following a surface activity proxy. The results will be discussed.
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