ON THE MODELING OF FUNDAMENTAL ION-CYCLOTRON ABSORPTION BY FINITE LARMOR RADIUS WAVE-EQUATIONS

Modified sixth order wave equations from a finite temperature expansio n of the linearized Vlasov-Maxwell equations in the ion cyclotron rang e of frequencies are constructed for modelling the power deposition of the fast magnetosonic wave whenever a majority or high concentration minority fundamental cyclotron resonance resides in a plasma. The nega tive absorption sometimes observed around the cyclotron resonance in t he solutions of the equations obtained by a rigorous perturbation expa nsion to second order in ion Larmor radius is avoided.