Abstract
The modified C.G.L. equation which includes the effect of the finite Larmor radius of the ion is applied to the study of hydromagnetic wave propagation in a collisionless plasma. The dispersion relation is given for a linearized system in which waves propagate in the direction normal to a magnetic field. Then the dispersive effects of the finite ion Larmor radius and the electron inertia are investigated in various cases. A precursor with an oscillatory structure appears in front of the main disturbance due to the former effect, and the latter gives rise to an oscillatory trail following behind.
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