The electromagnetic interchange mode in a partly-ionized collisional plasma

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Abstract
A collisional electromagnetic dispersion relation is derived from two-fluid theory for the interchange mode coupled to the Alfvé n, acoustic, drift and entropy modes in a partly-ionized plasma. The fundamental electromagnetic nature of the interchange mode is noted: coupling to the intermediate Alfvé n mode is strongly stabilizing for finite k2. Both ion– viscous and ion–neutral stabilization are included; and it is found that collisions destroy the FLR cutoff at short perpendicular wavelengths.

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