Destabilization of hydromagnetic driftAlfven waves in a finite pressure collisional plasma
Abstract
In a finite beta plasma, where the plasma pressure is an appreciable fraction of the confining magnetic field energydensity, densitygradient driven drift waves couple with Alfven waves when the phase velocities of the two waves become comparable. The resulting hydromagnetic driftAlfven waves separate into two branches  a drift mode and an Alfven mode, with both modes exhibiting magnetic field and localized density fluctuations near the coupling point. The dispersion relation of the collisional driftAlfven wave is derived by using a slabgeometry, twofluid model which includes finite beta, electronion collisions, ionion collisions, finite ion larmar radius, temperature fluctuations, and an axial electron current. A hydromagnetic drift mode is found to be unstable in a moderately dense plasma. A localized Alfven mode is destabilized only with the passage of an axial current along the plasma column.
 Publication:

California Univ., Los Angeles Report
 Pub Date:
 November 1974
 Bibcode:
 1974ucla.rept.....T
 Keywords:

 Collisional Plasmas;
 Magnetohydrodynamic Waves;
 Plasma Oscillations;
 Electron Density (Concentration);
 Electron Energy;
 Gas Discharges;
 Ion Density (Concentration);
 Magnetohydrodynamic Stability;
 Numerical Analysis;
 Plasma Pressure;
 Plasma Physics