Detection of periodic signatures in the solar power spectrum. On the track of l=1 gravity modes

Details Detection of periodic signatures in the solar power spectrum. On the track of l=1 gravity modes Detection of periodic signatures in the solar power spectrum. On the track of l=1 gravity modes

2006-11-27

arxiv.org/abs/astro-ph/0611806v1

ESA SP-624, 2006

Astronomy and Astrophysics

Astrophysics

Proceedings of the SOHO-18/GONG2006/HELAS I: Beyond the spherical Sun

Scientific paper

In the present work we show robust indications of the existence of g modes in the Sun using 10 years of GOLF data. The present analysis is based on the exploitation of the collective properties of the predicted low-frequency (25 to 140 microHz) g modes: their asymptotic nature, which implies a quasi equidistant separation of their periods for a given angular degree (l). The Power Spectrum (PS) of the Power Spectrum Density (PSD), reveals a significant structure indicating the presence of features (peaks) in the PSD with near equidistant periods corresponding to l=1 modes in the range n=-4 to n=-26. The study of its statistical significance of this feature was fully undertaken and complemented with Monte Carlo simulations. This structure has a confidence level better than 99.86% not to be due to pure noise. Furthermore, a detailed study of this structure suggests that the gravity modes have a much more complex structure than the one initially expected (line-widths, magnetic splittings...). Compared to the latest solar models, the obtained results tend to favor a solar core rotating significantly faster than the rest of the radiative zone. In the framework of the Phoebus group, we have also applied the same methodology to other helioseismology instruments on board SoHO and ground based networks.

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