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Both observations and simulations suggest that the solar filament eruption isclosely related to magnetic flux emergence. It is thought that the eruption istriggered by magnetic reconnection between the filament and the emerging flux.However, the details of such a reconnection are rarely presented. In thisstudy, we report the detailed reconnection between a filament and its nearbyemerging fields, that led to the reconfiguration and subsequent partialeruption of the filament located over the polarity inversion line of activeregion 12816. Before the reconnection, we observed repeated brightenings in thefilament at a location that overlies a site of magnetic flux cancellation.Plasmoids form at this brightening region, and propagate bi-directionally alongthe filament. These indicate the tether-cutting reconnection that results inthe formation and eruption of a flux rope. To the northwest of the filament,magnetic fields emerge, and reconnect with the context ones, resulting inrepeated jets. Afterwards, another magnetic fields emerge near the northwesternfilament endpoints, and reconnect with the filament, forming the newlyreconnected filament and loops. Current sheet repeatedly occurs at theinterface, with the mean temperature and emission measure of 1.7 MK and1.1$\times$10$^{28}$ cm$^{-5}$. Plasmoids form in the current sheet, andpropagate along it and further along the newly reconnected filament and loops.The newly reconnected filament then erupts, while the unreconnected filamentremains stable. We propose that besides the orientation of emerging fields,some other parameters, such as the position, distance, strength, and area, arealso crucial for triggering the filament eruption.

Reconfiguration and eruption of a solar filament by magnetic reconnection with an emerging magnetic field