OSCILLATIONS IN QUASI-NEUTRAL PLASMAS

The purpose of this article is to describe the limit, as the vacuum el ectric permittivity goes to zero, of a plasma physics system, deduced from the Vlasov-Poisson system for special initial data (distribution functions which are analytic in the space variable, with compact suppo rt in velocity), a limit also called ''quasineutral regime'' of the pl asma, and the related oscillations of the electric field, with high fr equency in time.