Parametric generation of whistler waves due to the interaction of high-frequency wave beams with a magnetoplasma |
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Authors: | M E Gushchin S V Korobkov A V Kostrov A V Strikovskii |
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Institution: | (1) Institute of Applied Physics, Russian Academy of Sciences, Nizhni Novgorod, 603950, Russia |
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Abstract: | The parametric generation of low-frequency whistler waves by a pump wave beam formed by high-frequency whistler waves with close frequencies is studied experimentally. The electromagnetic fields excited by the beats of two co- or counterpropagating high-frequency waves, or by an amplitude-modulated pump are studied. It is shown that the nonlinear currents at the beat (modulation) frequency are generated by a transverse ponderomotive force arising due to the finite width of the high-frequency beam. In this case, the nonlinear azimuthal drift currents enclose the pump beam and can radiate low-frequency whistler waves to the surrounding plasma. |
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