Finite Larmor Radius Effects on Mirror waves

A fully kinetic theory of magnetic mirror instability is used to deduce the finite ion Larmor radius effects on the growth rate and polarisation mirror waves. The incorporation of this effect results in a substantial modification of both the instability growth rate and the instability threshold. The modification is due to the fact that for wavelengths of the order of the ion Larmor radius the effective elasticity of the magnetic field lines is substantially enhanced. Theoretical results are compared with experimental finding.