The stellar internal magnetism is presently poorly known, even we have now some evidence that it plays a crucial role in different stages of stellar evolution. I first recall the helioseismic results coming from the SOHO mission on the deep interior. Then I show how we hope to observe directly or indirectly the deep solar magnetism by the simultaneous detection of gravity modes, acoustic modes and other phenomena. The two following sections compare the different techniques of observation and show the interest of a multichannel resonant spectrometer both for studying the deep dynamics of the core and for putting some constraints on the stellar atmospheric models. The last section describes the DynaMICCS mission submitted to ESA in the framework of Cosmic Vision 2015–2025 and the observations of the coming decade with the GOLF–NG instrument dedicated to the magnetism of the core and to the region located between photosphere and chromosphere.