The new solar abundances - Part II: the crisis and possible solutions

Recent 3D, NLTE analysis of the solar spectrum (Asplund et al.2005b, Part I; Asplund et al. 2005a) have led to a signican t reduction of the CNO and Ne abundances leading to a (Z=X)s 30% smaller than previously recommended value. The corresponding decrease in opacity increases dramatically the discrepancies between the sound-speed derived from helioseismology and our new standard solar models (SSM). We present in this paper some numerical experiments trying to reduce this discrepancy.