Abstract
This chapter presents the basic theoretical background of collisionless shock physics. It states the basic process of shock formation as the growth of a small disturbance in the plasma by the action of the intrinsic nonlinearity of flow, independent of the cause of the initial disturbance. The latter can be an external driver like a piston or a blast, it can also be an internal instability. Shocks form when nonlinearity causes steeping (or steepening) of the disturbance in space and some process exists which prevents breaking of the steep wave. Such processes are of dissipative or dispersive nature and are discussed in ascending importance. An intermediate step is the evolution of solitary waves based on the Sagdeev pseudo-potential. After this fundamental discussion, the plasma kinetic equations are given and the Rankine-Hugoniot jump conditions at shocks are derived with the shock solutions explicitly given. Critical Mach numbers are defined beyond which dissipation is unable to prevent wave breaking. The relevant wave instabilities causing initial disturbances, dispersion and dissipation are discussed at length. Transport ratios are given, and anomalous transport is reviewed. Finally, shock particle reflection is identified as the basic process of shock stabilisation preventing breaking. The last section provides a cursory and incomplete briefing on numerical simulation techniques.
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- 1.
It might be of interest to note that to find a method that solves this general time-dependent equation analytically took more than a century, and for this purpose it was necessary to develop the whole apparatus of non-relativistic quantum mechanics. This was done in a seminal paper by Gardner et al [1967].
- 2.
In fact there is one exception to this statement. There exist free space electromagnetic mode branches (radiation) above and even below the electron cyclotron frequency on which electron excited electromagnetic waves could in principle propagate. The mechanism to excite them is the electron cyclotron maser instability [for a recent review see, e.g, Treumann, 2006], which is a very particular instability that becomes awakened under conditions which to our knowledge are barely satisfied in the non-relativistic shock environment.
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Balogh, A., Treumann, R.A. (2013). Basic Equations and Models. In: Physics of Collisionless Shocks. ISSI Scientific Report Series, vol 12. Springer, New York, NY. https://doi.org/10.1007/978-1-4614-6099-2_3
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