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Ion-scale magnetospheres have been observed around comets, weakly-magnetizedasteroids, and localized regions on the Moon, and provide a unique environmentto study kinetic-scale plasma physics, in particular in the collisionlessregime. In this work, we present the results of particle-in-cell simulationsthat replicate recent experiments on the Large Plasma Device at the Universityof California, Los Angeles. Using high-repetition rate lasers, ion-scalemagnetospheres were created to drive a plasma flow into a dipolar magneticfield embedded in a uniform background magnetic field. The simulations areemployed to evolve idealized 2D configurations of the experiments, studyhighly-resolved, volumetric datasets and determine the magnetosphericstructure, magnetopause location and kinetic-scale structures of the plasmacurrent distribution. We show the formation of a magnetic cavity and a magneticcompression in the magnetospheric region, and two main current structures inthe dayside of the magnetic obstacle: the diamagnetic current, supported by thedriver plasma flow, and the current associated to the magnetopause, supportedby both the background and driver plasmas with some time-dependence. Frommultiple parameter scans, we show a reflection of the magnetic compression,bounded by the length of the driver plasma, and a higher separation of the maincurrent structures for lower dipolar magnetic moments.

Laser-Driven, Ion-Scale Magnetospheres in Laboratory Plasmas. II. Particle-in-cell Simulations