Observations of a Two-sided Loop Jet and Magnetic Reconnection Involving a Medium-scale Filament Eruption

Abstract Although multiscale filament eruptions serve as significant triggers for various energetic release processes in the solar atmosphere, the underlying mechanisms remain elusive. Using coordinated observations from the New Vacuum Solar Telescope, Solar Dynamics Observatory, and Chinese H α Solar Explorer, we present a unique two-sided loop jet and evidence of magnetic reconnection driven by a medium-scale filament eruption within a lantern-like structure. Reconnection between the brightening part of the erupting filament and the overlying S-shaped magnetic loops produced the two-sided loop jet. This jet exhibited asymmetric spires, an S-shaped morphology, coexistence of hot and cool components, and a threefold speed difference between spires resulting from uneven magnetic confinement. Clockwise rotation indicates twists transferred from the filament to the S-shaped loops. The eruption also induced reconnection between adjacent coronal loops, forming a current sheet near the postflare loops. Concurrently, the rotation and descent of the dark part of the erupting filament drove the reconfiguration of the ambient chromospheric magnetic field through secondary effects, resulting in the appearance of a new set of chromospheric fibrils. Subsequent reconnection between these new and preexisting fibrils was confirmed by reconnection inflows and outflows, a current sheet, cusp-shaped structures, and expelled plasma blobs. Therefore, both eruptive events are directly or indirectly involved in driving the reconfiguration of the local magnetic field, facilitating the release and transfer of mass and energy across the solar atmosphere via jet and magnetic reconnection.