Supermagnetosonic jets behind a collisionless quasi-parallel shock

Details Supermagnetosonic jets behind a collisionless quasi-parallel shock Supermagnetosonic jets behind a collisionless quasi-parallel shock

2009-11-09

arxiv.org/abs/0911.1687v1

Physics

Plasma Physics

accepted to Phys. Rev. Lett. (Nov 5, 2009)

Scientific paper

The downstream region of a collisionless quasi-parallel shock is structured containing bulk flows with high kinetic energy density from a previously unidentified source. We present Cluster multi-spacecraft measurements of this type of supermagnetosonic jet as well as of a weak secondary shock front within the sheath, that allow us to propose the following generation mechanism for the jets: The local curvature variations inherent to quasi-parallel shocks can create fast, deflected jets accompanied by density variations in the downstream region. If the speed of the jet is super(magneto)sonic in the reference frame of the obstacle, a second shock front forms in the sheath closer to the obstacle. Our results can be applied to collisionless quasi-parallel shocks in many plasma environments.

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