Alfvén wave, here shown in |vA|, for the improper null ϵ = 0.5. As azimuthal symmetry is broken, we show two planes y = 0 and x = 0 (left and right columns respectively). For this null, fieldlines predominantly align to run parallel to the x-axis (see Fig. 1); note that the pulse spreads at different rates in the different planes.
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