The subject of this paper is the structure of discrete auroral arcs and bands. The mechanism for acceleration of auroral electrons is taken to be the V-shock structures characterized by electric fields oblique to the magnetic field. The starting point in the analysis is that the accelerating voltages are generated by electrostatic MHD turbulence. A numerical simulation is used to illustrate how the large potential differences, necessary for acceleration of auroral electrons, can be generated across magnetic fields by the turbulent cascade. It is shown that this generation mechanism requires a flow of enstrophy to short wavelengths as well as a flow of energy to long wavelengths. The most important result is that it is shown that the limitation of upward field-aligned current by the V shocks can result in a clustering of precipitation regions and the imposition of a long-range order on patterns of auroral precipitation. It is argued that this effect is likely responsible for the multiple, regular auroral bands observed during quiet conditions. When the auroral electric fields become sufficiently intense, turbulent cascade is initiated which breaks up the well-ordered structure. It is concluded that the regions of energy input into the cascade must be loosely coupled to the region where the electrons are accelerated.