Collisionless dissipation processes in quasi-parallel shocks

• Published in: Geophysical research letters Vol. 10; no. 6; pp. 471 - 474
• Main Authors: Quest, K. B., Forslund, D. W., Brackbill, J. U., Lee, K.
• Format: Journal Article
• Language: English
• Published: Legacy CDMS Blackwell Publishing Ltd 01.06.1983; American Geophysical Union
• Subjects: Earth, ocean, space; Evolution; Exact sciences and technology; External geophysics; Fluid dynamics; Flux; Geophysics; Heating; Interaction between magnetosphere and interplanetary space; Magnetic fields; Physics of the magnetosphere; Specular reflection; Turbulence; Upstream; Energy dissipation; Particle motion; Collisionless plasma; Mathematical model; Magnetospheric shock wave; Guiding center; Magnetosphere
• ISSN: 0094-8276; 1944-8007
• DOI: 10.1029/GL010i006p00471

The evolution of collisionless, quasi-parallel shocks (the angle between the shock normal and the upstream magnetic field being less than 45 deg) is examined using two dimensional particle simulations. Reflected ions upstream from the shock are observed with average guiding center velocity and gyrational energy which agree well with the prediction of simple specular reflection. Strong ion heating through the shock ramp is apparently caused by large amplitude whistler turbulence. A flux of suprathermal electrons is also the magnetic field direction. Much stronger ion heating occurs in the shock than electron heating. The relevance of this work to the earth's bow shock is discussed.