Kinetic and fluid approaches to low-frequency magnetohydrodynamics: A comparison

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Abstract
Kinetic and fluid approaches to the problem of low‐frequency magnetohydrodynamic flute stability of plasmas where the equilibrium electron gradient‐B drift is larger than the curvature drift are compared. It is shown that the two approaches are practically identical for frequencies below the curvature drift frequency. The identical nature of the approaches has to do with the fact that the large gradient‐B drift has the primary effect of maintaining the electron temperature constant along its path; since this fact is independent of the collision frequency, the same equation of state applies to both approaches.