The Merging of a Coronal Dimming and the Southern Polar Coronal Hole

We report on the merging between southern polar coronal hole and an adjacent dimming induced by a mass ejection 2022 March 18, resulting in merged region persisting for at least 72 hrs. use remote sensing data from multiple co-observing spacecraft to understand physical processes during this event. The evolution of merger is examined using Extreme-UltraViolet (EUV) images obtained Atmospheric Imaging Assembly onboard Solar Dynamic Observatory Extreme Ultraviolet Imager Orbiter spacecraft. plasma dynamics are quantified spectroscopic EUV Spectrometer Hinode. photospheric magnetograms Helioseismic Magnetic used derive magnetic field properties. To our knowledge, work first spectroscopical analysis two open-field structures. find that become indistinguishable after merging. upflow speeds inside more similar hole, with mixture upflows downflows observable brightening bright points appearance jets further imply ongoing reconnection processes. propose component fields plays important role event, as footpoint switching allows intrude onto boundary hole.