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Astron. Astrophys. 330, 341-350 (1998)


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Are solar acoustic modes correlated?

T. Foglizzo 1, R.A. García 1, P. Boumier 2, J. Charra 2, A.H. Gabriel 2, G. Grec 3, J.M. Robillot 4, T. Roca Cortés 5, S. Turck-Chièze 1 and R.K. Ulrich 6

1 Service d'Astrophysique, DAPNIA/DSM, CE-Saclay, F-91191 Gif-sur-Yvette, France
2 Institut d'Astrophysique Spatiale, Orsay, France
3 Observatoire de la Côte d'Azur, Lab. Cassini CNRS URA1362, F-06304 Nice, France
4 Observatoire de l'Universite Bordeaux 1, BP 89, F-33270 Floirac, France
5 Instituto de Astrofísica de Canarias, E-38205 La Laguna, Tenerife, Spain
6 UCLA, Department of Physics and Astronomy, Los Angeles, USA

Received 18 July 1997 / Accepted 17 September 1997

Abstract

We have studied the statistical properties of the energy of individual acoustic modes, extracted from 310 days of GOLF data near the solar minimum. The exponential distribution of the energy of each mode is clearly seen. The modes are found to be uncorrelated with a [FORMULA] accuracy, thus supporting the hypothesis of stochastic excitation by the solar convection.
Nevertheless, the same analysis performed on the same modes just before the solar maximum, using IPHIR data, rejects the hypothesis of no correlation at a [FORMULA] confidence level.

A simple model suggests that [FORMULA] of the energy of each mode is coherent among the modes studied in IPHIR data, correponding to a mean correlation of [FORMULA].

Key words: Sun: oscillations; magnetic fields – methods: analytical, statistical

Send offprint requests to: foglizzo@cea.fr

© European Southern Observatory (ESO) 1998

Online publication: January 8, 1998
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