Turbulence in Magnetic Reconnection Jets from Injection to Sub-Ion Scales

We investigate turbulence in magnetic reconnection jets in the Earth’s magnetotail using data from the Magnetospheric Multiscale spacecraft. We show that signatures of a limited inertial range are observed in many reconnection jets. The observed turbulence develops on the time scale of a few ion gyroperiods, resulting in intermittent multifractal energy cascade from the characteristic scale of the jet down to the ion scales. We show that at sub-ion scales, the fluctuations are close to mono-fractal and predominantly kinetic Alfvén waves. The observed energy transfer rate across the inertial range is $\sim {10}^8\mathrm{J}{\mathrm{k}\mathrm{g}}^{-1}{\mathrm{s}}^{-1}$, which is the largest reported for space plasmas so far.