On the noncoplanarity of the magnetic field within a fast collisionless shock

Details On the noncoplanarity of the magnetic field within a fast collisionless shock On the noncoplanarity of the magnetic field within a fast collisionless shock

Mar 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987jgr....92.2305t&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 92, March 1, 1987, p. 2305-2314. DOE-sponsored research.

Physics

45

Collisionless Plasmas, Magnetic Fields, Plasma Waves, Polarization (Charge Separation), Shock Waves, Electric Fields, Flow Velocity

Scientific paper

Within the magnetic ramp of fast collisionless plasma shocks observed with spacecraft instruments and simulated numerically, the magnetic field undergoes an excursion out of the plane of coplanarity. This rotation is consistently in the direction such that the electrostatic potential jump across the shock, as measured in the de Hoffman-Teller frame of the reference (HTF), is about 2-6 times smaller than the electrostatic potential jump measured in the normal incidence frame. The preferred direction is consistent with a basic whistler mode transition between the upstream and downstream orientations. The potential jump in the HTF is considerably smaller than the change in bulk flow energy across the shock, confirming the recent suggestion that magnetic forces contribute importantly to the slowing of the plasma in that frame. A further consequence is that suprathermal particles leaking back into the upstream region across the shock do not gain much energy from the cross-shock electric field.

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