Eruptions from coronal bright points: A spectroscopic view by IRIS of a mini-filament eruption, QSL reconnection, and reconnection-driven outflows

Context. Our study investigates a mini-filament eruption associated with cancelling magnetic fluxes. The originates from small-scale loop complex commonly known as coronal bright point (CBP). event is uniquely recorded in both the imaging and spectroscopic data taken Interface Region Imaging Spectrograph (IRIS). Aims. investigation aims to gain better understanding of physical processes driving these ubiquitous eruptions. Methods. We analysed IRIS slit-jaw observations well images extreme-ultraviolet channels Atmospheric Assembly (AIA) line-of-sight magnetic-field Helioseismic Magnetic Imager (HMI) on board Solar Dynamics Observatory. As can only indicate possible at play, we also employed non-linear force-free field (NLFFF) relaxation approach based HMI magnetogram time series. This allowed us further investigate evolution structures involved process. Results. identified strong brightening micro-flare CBP, emission chromospheric flaring plasmas. mini-eruption manifested via ejection hot (CBP loops) cool (mini-filament) plasma data. preceded by appearance an elongated feature 1400 Å images, located above polarity inversion line. starts pixel size propagates bi-directionally along feature. detected, spectral AIA data, flows edges feature; believe that represent reconnection outflows. Both wrap around erupting MF evolve into J-type shape, creating sigmoid appearance. A quasi-separatrix layer (QSL) vicinity line computing squashing factor, Q , different horizontal planes NLFFF model. Conclusions. CBP spectro-imaging provides evidence CBPs downscaled active regions and, such, they may make significant contribution mass energy balance solar atmosphere. They are sources all range typical active-region features, including QSLs, (mini-)filament eruptions, (micro-)flaring, outflows, etc. QSL site has same so-called explosive events blue- red-shifted emission, thus providing answer outstanding question regarding true nature this phenomenon.