Abstract
Using a general expression for the power absorbed by transit time magnetic pumping, the resonances in the heating, due to the three low-frequency electromagnetic waves which can propagate in a plasma in a magnetic field, are calculated. The strengths and widths of the three resonances are compared under conditions where the electrons absorb most of the power. The ion-acoustic resonance is the broadest and the magneto-acoustic (or compressional Alfvén) the strongest. The Alfvén (or shear Alfvén) wave is undamped when cyclotron damping and terms of order ω2/ωci2 are neglected. However, when terms of order ω2/ωci2 are included, the Alfvén wave is shown to have a stronger resonance than the ion-acoustic wave. Numerical results have also been obtained for the magneto-acoustic resonance under conditions where the ions are also heated and the width of the resonance is much broader than for pure electron heating.
Published Version
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