Evolution of the electron phasespace (insets a1–3 and b1–3) and DC magnetic field peak (insets a4 and b4); log–log is used to display linear DC peak evolution in inset a4, and log–linear is used to display exponential evolution in inset b4. Left: 1D warm shear flow with ﹩{{v}_{0}}=0.2c﹩ and ﹩{{v}_{th}}=0.016c﹩. Right: 2D cold shear flow for the same ﹩{{v}_{0}}﹩. The blue (red) color represents the electrons with a negative (positive) drift velocity ﹩{{v}_{0}}﹩. The self-consistent DC magnetic field is represented by the solid curve, whereas the dashed curve represents the magnetic field given by the theoretical model.