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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Original Russian Text © M.E. Gushchin, S.V. Korobkov, A.V. Kostrov, A.V. Strikovskii, 2008, published in Pis’ma v Zhurnal Éksperimental’noĭ i Fiziki, 2008, Vol. 88, No. 11, pp. 834–838.
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Gushchin, M.E., Korobkov, S.V., Kostrov, A.V. et al. Parametric generation of whistler waves due to the interaction of high-frequency wave beams with a magnetoplasma. Jetp Lett. 88, 720–724 (2008). https://doi.org/10.1134/S0021364008230045
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DOI: https://doi.org/10.1134/S0021364008230045