Plasma three-wave interactions
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Plasma three-wave interactions
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This study presents an experimental observation of a three-wave coupling between a shear Alfvén wave and a kink-unstable magnetic flux rope in a laboratory setting. By launching an Alfvén wave in a current-carrying plasma column, researchers observed the emergence of sidebands in the frequency power spectrum of the Alfvén wave, spaced by integer multiples of the kink frequency. The researchers demonstrate that these sidebands satisfy both frequency and wavenumber matching conditions for three-wave interactions. Bispectral analysis reveals a significant quadratic nonlinear interaction between the kink and Alfvén waves, which drives the generation of the sidebands. This study highlights the importance of nonlinear wave-wave interactions in plasmas, particularly in understanding energy transport and heating mechanisms in astrophysical and laboratory settings.
URLS:
Basic Plasma Science Facility: https://plasma.physics.ucla.edu
Article being discussed: https://doi.org/10.1063/5.0217895
S. Vincena, S. K. P. Tripathi, W. Gekelman, P. Pribyl; Three-wave coupling observed between a shear Alfvén wave and a kink-unstable magnetic flux rope. Phys. Plasmas 1 September 2024; 31 (9): 092302.