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Astron. Astrophys. 345, 1019-1026 (1999)

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Solar oscillations: time analysis of the GOLF p-mode signal

C. Renaud 1, G. Grec 1, P. Boumier 2, A.H. Gabriel 2, J.M. Robillot 3, T. RocaCortés 4, S. Turck-Chièze 5 and R.K. Ulrich 6

1 Département Cassini, UMR 6529 du CNRS, Observatoire de la Côte d'Azur, F-06304 Nice, France
2 Institut d'Astrophysique Spatiale, Unité Mixte CNRS et Université Paris XI, F-91405 Orsay, France
3 Observatoire de l'Université Bordeaux 1, B.P. 89, F-33270 Floirac, France
4 Instituto de Astrofísica de Canarias, E-38205 La Laguna, Tenerife, Spain
5 Service d'Astrophysique, DSM/DAPNIA, CE Saclay, F-91191 Gif-sur-Yvette, France
6 Astronomy Department, University of California, Los Angeles, USA

Received 30 October 1998 / Accepted 12 March 1999

Abstract

We determine the intrinsic phase lag of the GOLF data for the solar p-mode velocity deduced either from one of the narrow band photometers working alternatively on blue and red wing of the sodium lines. The timing of the "blue wing" velocity coming from the current GOLF data is given in respect to the ground-based observations. The phase lag for the "blue" velocity is 6 s in advance relatively to a velocity coming from a differential device. For individual p modes, the phase lag from the "blue" velocity to the "red" velocity are not in opposition of phase, as expected in a very simple solar model, but differs from 8o to 18o from the opposition, depending on the degree and the radial order of the acoustic mode. The measurement of the differential lag between the blue and red wings of the D lines may open a new way to monitor the temperature oscillations with the optical depth.

Key words: Sun: oscillations

Send offprint requests to: C. Renaud

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© European Southern Observatory (ESO) 1999

Online publication: April 28, 1999
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