After writing a coupled system between linarized Euler equations with dissipation coupled with Maxwell equations, under a strong magnetic field in a variable density plasma, we derive the system satisfied by the partial Fourier transform of the solution. This system has singularities at physical resonances and we describe carefully the solution at these resonances, which are not high frequency resonances. Ceci se fait en utilisant des fonctions de Bessel.

Travail en commun avec Bruno Després et Lise-Marie Imbert-Gérard