Abstract
For three different distribution functions, the analysis of low-frequency flutelike instabilities of a low-β collisionless plasma immersed in the magnetic field of a line current indicates that the qualitative characteristics of the instabilities are independent of the distribution function. The analysis is valid for arbitrary curvature in the absence of magnetic shear and mirror effects. Numerical results for the growth rate and phase velocity for one of the distribution functions illustrate the behavior of the various instabilities, and comparison with Taylor's minimum-B theorem shows which particles in velocity space provide the energy to drive the instabilities.
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