Interplay between long and short wavelength instabilities feeding the microturbulence within the foot of a quasi-perpendicular supercritical shock: 2D PIC numerical simulations

Laurent Muschietti (1, 2) , Bertrand Lembège (1) , V. Decyk (3)

1 HELIOS - LATMOS
2 SSL - Space Sciences Laboratory [Berkeley]
3 Department of Physics and Astronomy [UCLA, Los Angeles]

In supercritical shocks a substantial fraction of ions is reflected at the steep shock ramp. The beam of reflected ions carries a considerable amount of energy and is a main source of microturbulence in the shock’s foot. For quasi- perpendicular geometries the speed of the reflected ions is mostly directed at 90◦ to the background magnetic field Bo. This enables streaming instabilities excited by the relative drifts between incoming ions, reflected ions, and electrons across Bo.

Domaines: Physique Atmosphérique et Océanique [physics.ao-ph]

Laurent Muschietti, Bertrand Lembège, V. Decyk. Interplay between long and short wavelength instabilities feeding the microturbulence within the foot of a quasi-perpendicular supercritical shock: 2D PIC numerical simulations. URSI GASS 2021. Proceedings, Aug 2021, Rome, Italy. ⟨insu-03598257⟩