0537534 - FZÚ 2021 RIV US eng J - Journal Article
Moreno-Gelos, Quentin - Araudo, Anabella Teresa - Korneev, Ph. - Li, C.K. - Tikhonchuk, Vladimir - Ribeyre, X. - d'Humieres, E. - Weber, Stefan A.
Mildly relativistic collisionless shock formed by magnetic piston.
Physics of Plasmas. Roč. 27, č. 12 (2020), s. 1-13, č. článku 122106. ISSN 1070-664X. E-ISSN 1089-7674
R&D Projects: GA ČR(CZ) GA20-19854S; GA MŠMT EF16_019/0000789; GA MŠMT EF15_003/0000449
Grant - others:OP VVV - ADONIS(XE) CZ.02.1.01/0.0/0.0/16_019/0000789; OP VVV - HiFi(XE) CZ.02.1.01/0.0/0.0/15_003/0000449
Institutional support: RVO:68378271
Keywords : astrophysics * collisionless shock * Weibel instability * turbulence * kinetic simulations
OECD category: Fluids and plasma physics (including surface physics)
Impact factor: 2.023, year: 2020
Method of publishing: Limited access
https://doi.org/10.1063/1.5144683

By using particle-in-cell simulations, we study the collision of two plasma flows with one of them carrying a magnetic field. Ion interpenetration results in the formation of a magnetic piston with the magnetic field compression proportional to the density ratio of the colliding plasmas. The counterpropagating ions in the nonmagnetized plasma upstream from the piston excite the ion Weibel instability, which turns into magnetic turbulence. The thickness of the piston increases with time, and it turns into a reverse magnetized shock after less than one ion gyro period. In front of the piston, the time needed to decrease the nonmagnetized ion anisotropy using the magnetic turbulence is much larger than the ion gyroperiod in the piston. Consequently, particles are reflected by the piston, which acts as a wall initiating a transient phase. After several ion periods, the formation of this electromagnetic forward shock is, then, accelerated by the piston, and at large timescale.

Permanent Link: http://hdl.handle.net/11104/0315340