The Alfvén resonance in pair plasmas

Cramer, N. F.
February 2010
Physics of Plasmas;Feb2010, Vol. 17 Issue 2, p022103
Academic Journal
The absorption of wave energy in a magnetized cold pair plasma at the analog of the Alfvén resonance is considered. Splitting of the parallel propagating wave modes due to imbalance of pair species densities is discussed. For oblique propagation of the waves, it is shown that, if the wave frequency is much less than the plasma frequency, there is an approximate resonance in the wave vector component perpendicular to the magnetic field, which may be identified as the analog of the Alfvén resonance in normal electron-ion plasmas. The wave differential equations for a nonuniform plasma also exhibit the resonance. The pair species charge imbalance plays a similar role in the Alfvén resonance process to the Hall term (or finite ion cyclotron frequency effect) in electron-ion plasmas. Wave absorption at the resonance can take place via mode conversion to the analog of the short wavelength inertial Alfvén wave, whose properties are discussed.


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