Are Solar Acoustic Modes Correlated ?

Details Are Solar Acoustic Modes Correlated ? Are Solar Acoustic Modes Correlated ?

1997-09-10

arxiv.org/abs/astro-ph/9709095v1

Astronomy and Astrophysics

Astrophysics

10 pages A&A Latex, 13 EPSF figures, to appear in A&A

Scientific paper

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 +-0.6 % 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 99.3 % confidence level. A simple model suggests that 31.3 +-9.4 % of the energy of each mode is coherent among the modes studied in IPHIR data, correponding to a mean correlation of 10.7 +-5.9 %.

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