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We investigate the properties of a sunspot light-bridge, focusing on thechanges produced by the impact of a plasma blob ejected from a C-class flare.We observed a sunspot in active region NOAA 12544 using spectropolarimetricraster maps of the four Fe I lines around 15655 \AA\ with the GREGOR InfraredSpectrograph (GRIS), narrow-band intensity images sampling the Fe I 6173 \AA\line with the GREGOR Fabry-P\'erot Interferometer (GFPI), and intensity broadband images in G-band and Ca II H band with the High-resolution Fast Imager(HiFI). All these instruments are located at the GREGOR telescope at theObservatorio del Teide, Tenerife, Spain. The data cover the time before,during, and after the flare event. The analysis is complemented withAtmospheric Imaging Assembly (AIA) and Helioseismic and Magnetic Imager (HMI)data from the Solar Dynamics Observatory (SDO). The physical parameters of theatmosphere at differents heights were inferred using spectral-line inversiontechniques. We identify photospheric and chromospheric brightenings, heatingevents, and changes in the Stokes profiles associated to the flare eruption andthe subsequent arrival of the plasma blob to the light bridge, after travelingalong an active region loop. The measurements suggest that these phenomena arethe result of reconnection events driven by the interaction of the plasma blobwith the magnetic field topology of the light bridge.

Signatures of the impact of flare ejected plasma on the photosphere of a sunspot light-bridge