Abstract
The filamentation instability of electromagnetic waves in a magnetoplasma has been studied. Two cases are considered separately: (i) duration of the microwave pulse longer than the heating time of electrons and the nonlinearity is caused by non-uniform heating and subsequent redistribution of carriers; (ii) duration of the pulse less than the heating time of electrons and the nonlinearity is caused by the ponderomotive force. The presence of a magnetic field (i) enhances the growth rate, (ii) reduces the threshold intensity and (iii) reduces the spatial separation of the striations. The growth rate is a saturating function of the beam intensity. In a collisionless plasma the filamentation takes place at much higher powers ( approximately 103 times) than in a collisional plasma.
Published Version
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