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Modelling the base of the solar convective envelope is a tedious problem.Since the first rotation inversions, solar modellers are confronted with thefact that a region of very limited extent has an enormous physical impact onthe Sun. Indeed, it is the transition region from differential to solid bodyrotation, the tachocline, which furthermore is influenced by turbulence and isalso supposed to be the seat of the solar magnetic dynamo. Moreover, solarmodels show significant disagreement with the sound speed profile in thisregion. In this paper, we show how helioseismology can provide furtherconstraints on this region by carrying out an inversion of the Ledouxdiscriminant. We compare these inversions for Standard Solar Models built usingvarious opacity tables and chemical abundances and discuss the origins of thediscrepancies between Solar Models and the Sun.

Inversions of the Ledoux discriminant: a closer look at the tachocline