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Collisions of acoustic solitons and their electric fields in plasmas at critical compositions
Verheest, Frank; Hereman, Willy A.
Acoustic solitons obtained through a reductive perturbation scheme are normally governed by a Korteweg-de Vries (KdV) equation. In multispecies plasmas at critical compositions the coefficient of the quadratic nonlinearity vanishes. Extending the analytic treatment then leads to a modified KdV (mKdV) equation, which is characterized by a cubic non…
Interplay between Kelvin-Helmholtz and lower-hybrid drift instabilities
Henri, Pierre; Pucci, Francesco; Lavorenti, Federico +3 more
Boundary layers in space and astrophysical plasmas are the location of complex dynamics where different mechanisms coexist and compete, eventually leading to plasma mixing. In this work, we present fully kinetic particle-in-cell simulations of different boundary layers characterized by the following main ingredients: a velocity shear, a density gr…
How non-stationary are moderately supercritical shocks?
Gedalin, Michael
Ion motion in a collisionless shock front is affected by macroscopic large-scale weakly varying and microscopic small-scale fast varying magnetic and electric fields. With the increase of the Mach number the role of the microscopic field is expected to become progressively more important. Using a combination of hybrid simulations and test particle…