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Astron. Astrophys. 339, 261-271 (1998)

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Are solar granules the only source of acoustic oscillations?

T. Foglizzo

Service d'Astrophysique, CEA/DSM/DAPNIA, CE-Saclay, F-91191 Gif-sur-Yvette, France

Received 27 July 1998 / Accepted 27 August 1998

Abstract

The excitation mechanism of low degree acoustic modes is investigated through the analysis of the stochastic time variations of their energy. The correlation between the energies of two different modes is interpreted as the signature of the occurrence rate of their excitation source. The different correlations determined by Foglizzo et al. (1998) constrain the physical properties of an hypothetical source of excitation, which would act in addition to the classical excitation by the turbulent convection. Particular attention is drawn to the effect of coronal mass ejections. The variability of their occurrence rate with the solar cycle could account for the variation of the correlation between IPHIR and GOLF data. Such an interpretation would suggest that the mean correlation between low degree acoustic modes is at least [FORMULA] at solar minimum.

Key words: Sun: oscillations – Sun: activity – Sun: flares – Sun: granulation – methods: statistical

Send offprint requests to: foglizzo@cea.fr

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© European Southern Observatory (ESO) 1998

Online publication: September 30, 1998
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