Abstract

It is demonstrated that waves excited by a beam of electrons in a cold collisionless magnetoactive plasma can be absorbed in the inhomogeneous region of the system. Absorption takes place in the neighbourhood of the resonance of the excited wave frequency with the plasma frequency ω0, cyclotron frequency ωo (when the inhomogeneity is in the direction of the external magnetic field) or hybrid frequency Ω = √(ω02 + ωo2) (when the inhomogeneity is transverse to the magnetic field). The particle acceleration that results, occurs in the direction of the magnetic field (plasma resonance) and in the transverse direction (cyclotron and hybrid resonances). As well as being absorbed, the waves are also reflected (in regions of hybrid resonance with a longitudinal inhomogeneity of the system and in regions of cyclotron and plasma resonance with a transverse inhomogeneity of the system).

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