Fig. 1

a) Longitudinal perturbations
vy for β = 0.1
plasma with η = ν = 0. Dotted and dashed lines
represent y = vAt and
y = cst
respectively. The blue line denotes the maximum amplitude:
.
b) Blow-up of region 100 ≤ y ≤ 200 for
vy. In both subfigures,
t = 1000τA.
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