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Whistler precursor and intrinsic variability of quasi-perpendicular shocks

Part of: Focus on Space Plasmas

Published online by Cambridge University Press:  15 February 2018

Gilad Granit  and
Michael Gedalin Open the ORCID record for Michael Gedalin [Opens in a new window]
Gilad Granit
Affiliation:
Department of Physics, Ben-Gurion University of the Negev, Beer-Sheva, Israel
Michael Gedalin*
Affiliation:
Department of Physics, Ben-Gurion University of the Negev, Beer-Sheva, Israel
*
†Email address for correspondence: gedalin@bgu.ac.il
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Abstract

The structure of a whistler precursor in a quasi-perpendicular shock is studied within two-fluid approach in one-dimensional case. The complete set of equations is reduced to the KdV equation, if no dissipation is included. With a phenomenological resistive dissipation the structure is described with the KdV–Burgers equation. The shock profile is intrinsically time dependent. For sufficiently strong dissipation, temporal evolution of a steepening profile results in generation of a stationary decaying whistler ahead of the shock front. With the decrease of the dissipation parameter, whistler wave trains begin to detach and propagate toward the upstream and the ramp is weakly time dependent. In the weakly dissipative regime the shock front experiences reformation.

Keywords

astrophysical plasmasplasma nonlinear phenomenaspace plasma physics
Type
Research Article
Information
Journal of Plasma Physics , Volume 84 , Issue 1 , February 2018 , 905840113
Copyright
© Cambridge University Press 2018 

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