Fundamentals of Nonrelativistic Collisionless Shock Physics: III. QuasiPerpendicular Supercritical Shocks
 Abstract
The theory and simulations of quasiperpendicular and strictly perpendicular collisionless shocks are reviewed. The text is structured into the following sections and subsections: 1. Setting the frame, where the quasiperpendicular shock problem is formulated, reflected particle dynamics is described in theoretical terms, foot formation and foot ion acceleration discussed, and the shock potential explained. 2. Shock structure, where the observational evidence is given, and where the simulation studies of quasiperpendicular shocks are described as far as they deal with shock structure, i.e. the discussion of the different physical shock scales, and their investigation in onedimensional simulations for small massratios, determination of the shocktransition scale in two ways, from experiment and from simulations which identifies two scales: the foot scale and the ramp scale, the latter being determined from the overshoot magnetic field, and shock reformation is described in one and twodimensional simulations, showing that there are regimes when no shock reformation occurs even in supercritical quasiperpendicular shocks, when the upstream plasma $\beta_i$ is high or when oblique whistlers stabilise the shock in two dimensions; but high Mach number shocks will always become nonstationary. 3. Ion dynamics, describing its role in shock reformation and the various ionexcited instabilities. 4. Electron dynamics, describing electron instabilities in the foot: Buneman and modified twostream instabilities, generation of electron tails and heating, generation of phasespace holes, and discussion of various wave properties, Weibel instability, 5. The problem of stationarity, posing the theoretical reasons for shocks being nonstationary, discussing nonlinear whistler mediated variability, twostream and modified twostream variability, formation of ripples in twodimensions, 6. Summary and conclusions: The possibility of shock breaking.
 BibTeX

@article{id1274, author = {Treumann, R. A. and Jaroschek, C. H.}, journal = {ARXIV [astroph]}, language = {en}, title = {Fundamentals of Nonrelativistic Collisionless Shock Physics: III. QuasiPerpendicular Supercritical Shocks}, volume = {0805.2181v1}, year = {2008}, }
 EndNote

%O Journal Article %A Treumann, R. A. %A Jaroschek, C. H. %J ARXIV [astroph] %G en %T Fundamentals of Nonrelativistic Collisionless Shock Physics: III. QuasiPerpendicular Supercritical Shocks %V 0805.2181v1 %D 2008