Speaker
Description
Deciphering the physical properties of flares is crucial for understanding the nature of one of the most energetic events on the Sun. We make use of high spatial and spectral resolution observations of a flare-producing active region, focusing on a complex light bridge, to analyse the physical properties of a C-class flare. The observations show Stokes profiles with different line Doppler shifts and asymmetries between photospheric and chromospheric spectral lines, and also reveal Ca II infrared spectral lines in emission in areas where atmospheric heating is extreme. Inversion results are compatible with the mentioned spectral features, with regions where plasma flows are opposite between the photosphere and chromosphere, and areas with extreme temperature in the chromosphere despite relatively weak plasma velocities. The magnetic field configuration also show abrupt changes along the line-of-sight for the former cases while it is constant with height in latter regions. The lack of line-of-sight flows at regions of extreme heating suggests that there are no indication of chromospheric condensation or evaporation pointing towards a new physical scenario related to the flare ribbon or a complex topology that prevents the detection of the expected plasma flows from a standard flare model scenario.