Magnetic Evolution of Mini-Coronal Mass Ejections

The present study investigates the relationship between mini-coronal mass ejections (mini-CMEs) and the evolution of their magnetic fluxes. An automatic detection algorithm was used to detect mini-dimmings in 171 images taken with the Atmospheric Imaging Assembly (AIA) onboard the Solar Dynamics Observatory (SDO). Using the difference images for the dimmings, 131 events that satisfied mini-CME signatures were selected. Changes in their magnetic structure using photospheric line-of-sight magnetograms taken with the Heliospheric and Magnetic Imager (HMI) on SDO were investigated. It was found that 27 % of the events had slight changes and 73 % showed considerable changes in magnetic flux. About 18 % of the magnetic structures evolved by cancellation and 38 % by complex flux changes.