  The magnetotail current sheet's spatial configuration and stability control
the onset of magnetic reconnection - the driving process for magnetospheric
substorms. The near-Earth current sheet has been thoroughly investigated by
numerous missions, whereas the midtail current sheet has not been adequately
explored. This is especially the case for the long-term variation of its
configuration in response to the solar wind. We present a statistical analysis
of 1261 magnetotail current sheet crossings by the Acceleration, Reconnection,
Turbulence and Electrodynamics of Moon's Interaction with the Sun (ARTEMIS)
mission orbiting the moon (X~-60 RE), collected during the entirety of Solar
Cycle 24. We demonstrate that the magnetotail current sheet typically remains
extremely thin, with a characteristic thickness comparable to the thermal ion
gyroradius, even at such large distances from Earth's dipole. We also find that
a substantial fraction (~one quarter) of the observed current sheets have a
partially force-free magnetic field configuration, with a negligible
contribution of the thermal pressure and a significant contribution of the
magnetic field shear component to the pressure balance. Further, we quantify
the impact of the changing solar wind driving conditions on the properties of
the midtail around the lunar orbit. During active solar wind driving
conditions, we observe an increase in the occurrence rate of thin current
sheets, whereas quiet solar wind driving conditions seem to favor the formation
of partially force-free current sheets.
