Reconnection observed at Earth's bow shock*

We study magnetic reconnection at the Earth's bow shock using observations by the Magnetospheric Multiscale (MMS) mission. The reconnecting current sheets exist both in the foreshock and in the deep shock transition region. The current sheets may contain the electron outflow jet, Hall fields and Hall currents, and show energy conversion between the fields and particles, while ions do not have response. There also exists reconnecting current sheets where the ion exhaust is observed with ion acceleration and heating. The compression of the current sheets originated from the foreshock waves appears to be one mechanism of generating thin current sheets subject to reconnection.