Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aspc..416..209g&link_type=abstract
Solar-Stellar Dynamos as Revealed by Helio- and Asteroseismology: GONG 2008/SOHO 21 ASP Conference Series, Vol. 416, proceedings
Astronomy and Astrophysics
Astronomy
Scientific paper
The detection and identification of the g-mode frequency spectrum has not really been achieved even after 13 yr of continuous measurement. We use here the Global Oscillations at Low Frequencies (GOLF) data to evaluate several types of an analysis using cross spectra. One provides an averaged value of the g-mode splitting, resulting in a core rotation faster than the surface rotation, with Rc < 2Rs. A g-mode frequency table is calculated from a solar model, with the assumption of uniform solar rotation in the radiative zone. We show the results of a template of phase-dependent analysis of the cross spectrum and discuss the comparison of the observations and the model. >From a statistical point of view, the search for a single mode faces serious ambiguities. A global approach seems to be the only realistic approach, but today we remain far from a conclusive measurement of g-mode frequencies.
Grec Gerard
Provost Janine
Renaud C.
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