The automated detection and analysis of short-term changes in coronal dimming regions

We present a new approach to the detection of coronal dimming regions. The Coronal Hole Evolution (CHEVOL; Krista 2011) algorithm was adapted to study the temporal evolution of dimming region properties using either SDO/AIA and HMI or SOHO/EIT and MDI data. The algorithm was found successful in locating dimming regions with relatively low intensities and clear boundaries. The area, location and magnetic properties of dimming regions were determined at high temporal cadence from the time of their appearance to the time of their disappearance. As a result, we were able to relate the dimming region properties to the corresponding CME properties. We examined CMEs with and without associated dimming regions to better understand CME energetics, connectivity and magnetic morphology. In addition, the rotation of dimming regions was investigated as a possible signature of flux-rope writhing.