4.3 Article

Exact nonlinear solutions for three-dimensional Alfven-wave packets in relativistic magnetohydrodynamics

期刊

JOURNAL OF PLASMA PHYSICS
卷 87, 期 6, 页码 -

出版社

CAMBRIDGE UNIV PRESS
DOI: 10.1017/S0022377821000970

关键词

strophysical plasmas; plasma nonlinear phenomena; plasma waves

资金

  1. NASA [NNX17AI18G, 80NSSC19K0829, 80NSSC21K0462, NNN06AA01C]

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The study demonstrates that large-amplitude, non-planar Alfven-wave packets are exact nonlinear solutions of the relativistic magnetohydrodynamic equations when the total magnetic-field strength in the local fluid rest frame is constant. These constant-b AWs propagate without distortion at the relativistic Alfven velocity and never steepen into shocks, suggesting their presence in relativistic outflows around compact astrophysical objects.
We show that large-amplitude, non-planar, Alfven-wave (AW) packets are exact nonlinear solutions of the relativistic magnetohydrodynamic equations when the total magnetic-field strength in the local fluid rest frame (b) is a constant. We derive analytic expressions relating the components of the fluctuating velocity and magnetic field. We also show that these constant-b AWs propagate without distortion at the relativistic Alfven velocity and never steepen into shocks. These findings and the observed abundance of large-amplitude, constant-b AWs in the solar wind suggest that such waves may be present in relativistic outflows around compact astrophysical objects.

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