Ion-electron resonances in bounded, hot plasmas with and without steady magnetic field

The investigation of a hot (T_e and T_i not=0) bounded electron-ion plasma is conducted sequentially. First the resonance spectrum of a plasma slab-condenser system and of a cylindrical plasma are investigated in the absence of a steady magnetic induction B₀. Then recover the classical results in the electron wave domain together with a set of ion thermal resonances, the simplest of which are the well-known pseudo-acoustic modes. It is then shown that this set of ion thermal resonances of a plasma cylinder is strongly affected by B₀ and disappears when the lower hybrid frequency is reached. One also finds in the ion domain a main dipolar resonance which is the continuation of one of the two magnetic branches which exist in the electron domain. Furthermore, the plasma column also exhibits two important, and hitherto unknown, main dipolar resonances which occur in the magnetoionic domain and which are mainly due to a proper combination of B₀ and T_e.