Cutoff conditions for transverse circularly polarized electromagnetic waves in 8 finite temperature electro-magneto-ionic medium

Ab&act-The dispersion relation for wave propagation in a homogeneous, electrically neutral electron gas subject to crossed static electric and magnetic fields is derived using the coupled Maxwell-Boltzmann-Vlasov equations. The cutoff condition for transverse circularly polarized electromagnetic waves is obtained from the derived dispersion relation. The variation of the cutoff frequency CO,, with the static electric field Es, magnetostatic field B,, the electron number density N and the electron gas temperature T is discussed. For example it is shown that for a given value of B, and N, either a decrease of the electron gas temperature T or an increase of static electric field E, will cause the cutoff frequency of the left-hand circularly polarized wave to increase while the cutoff frequency of the right-hand circularly polarized wave decreases. A possible application of the theory to the study of electromagnetic wave propagation in the region of ionospheric plasma, where both static electric and static magnetic fields are present, is indicated.