SOHO CoRoT Kepler Picard SDO GONG

Detection of individual dipole g modes in the Sun


Garcia Rafael A.


Service d'Astrophysique, CEA/Sacaly


Low degree solar and stellar seismology
Auteur(s) supplémentaire(s)J. Ballot, A. Eff-Darwich, R. Garrido, A. Jiménez, S. Mathis, S. Mathur, A. Moya, P.L. Pallé, C. Régulo, D. Salabert, K. Sato, J.C. Suarez, S. Turck-Chièze
Institution(s) supplémentaire(s)Service d'Astrophysique, CEA/Saclay


Since the detection of the asymptotic properties of the dipole gravity modes in the Sun, the quest to find individual gravity modes has continued. An extensive and deeper analysis of 14 years of continuous GOLF/SoHO observational data, unveils the presence of a pattern of peaks that could be interpreted as individual dipole gravity modes in the frequency range between 60 and 140 microHz, with amplitudes compatible with the latest theoretical predictions. By collapsing the power spectrum we have obtained a quite constant splitting for these patterns in comparison to regions where no g modes were expected. Moreover, the same technique applied to simultaneous VIRGO/SoHO data unveils some common signals between the power spectra of both instruments. Thus, we are able to identify and characterize individual g modes with their central frequencies, amplitudes and splittings allowing to do seismic inversions of the rotation profile inside the solar core. These results open a new light on the physics and dynamics of the solar deep core.
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