Schematic diagram of the waveforms of two Alfvén wavepackets. (a) A waveform that is symmetric about , and that therefore has no component. (b) An asymmetric waveform that includes a significant component.
Schematic of the Alfvén wave turbulence experiment on the LAPD. The Loop antenna generates a large-amplitude distorting Alfvén wave, with the wave magnetic field dominantly polarized in the x-direction, traveling up the equilibrium axial magnetic field, . The ASW antenna generates a small-amplitude probe Alfvén wave polarized in the y-direction traveling down the axial magnetic field.
Each panel depicts the component of the rightward propagating distorting Loop Alfvén wave (upper) and the component of the leftward propagating probe ASW Alfvén wave (lower). The length of the distorting Alfvén wave that has interacted with one point on the probe Alfvén wave (open circle) is depicted by the thick solid line in the upper plot of each panel.
Fourier decomposition of the distorting Alfvén wave signal over a length , showing that the waveform contains a significant component.
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