Update on g-mode research

De´partement Cassiope´e, UMR CNRS 6202, Observatoire de la Cote dAzur, BP 4229, 06304 Nice Cedex 4, FranceReceived October 2007, accepted February 2008Published online 2008Since the beginning of this century we have attended a blooming of the gravity-mode research thanks to the unprecedentedquality of the data available, either from space with SoHO, or from the ground-based networks as BiSON or GONG. Fromthe first upper limit of the gravity-mode amplitudes fixed at 1 0 mm/s at 200 µHz given by Appourchaux et al. (2000),on one hand, a peak was supposed to be a component of the l=1, n=1 mixed mode (Garc´ia et al. 2001a, b; Gabriel etal. 2002) and, on the other hand, a couple of patterns –multiplets– were attributed to gravity modes (Turck-Chie`ze et al.2004; Mathur et al. 2007). One of these patterns, found around 220 µHz, could be labeled as the l=2, n =-3 g mode, whichis expected to be the one with the highest surface amplitude (Cox and Guzik 2004). Finally, in 2007, Garc´ia et al. wereable to measure the fingertips of the dipole gravity modes loo king for their asymptotic properties. In the present paperwe present an update of the recent developments on this subject with special attention to the 220 µHz region, the dipoleasymptotic properties and the impact of the incoming g-modeobservations on the knowledge of the solar structure androtation profile.