2017/03/20 by Jiong Qiu, Jianxia Cheng
Medicine · Physics and Astronomy · #Astro and Planetary Science #Astrophysics #Coronal cloud #Coronal hole #Coronal loop #Coronal mass ejection #Coronal plane #Medicine #Nuclear physics #Phase (matter) #Physics #Plasma #Solar and Space Plasma Dynamics #Solar wind #Stellar, planetary, and galactic studies #astro-ph.SR
paper · pdf · doi:10.3847/2041-8213/aa6798
published as The Astrophysical Journal Letters, Volume 838, Issue 1, article id. L6, 6 pp. (2017)
openalex publication_date 2017/03/20 · openalex created_date 2017/04/07 · arxiv created 2017/07/08 · arxiv updated 2017/07/11 · openalex updated_date 2026/08/05
Abstract We report observations of a two-stage coronal dimming in an eruptive event of a two-ribbon flare and a fast coronal mass ejection (CME). Weak gradual dimming persists for more than half an hour before the onset of the two-ribbon flare and the fast rise of the CME. It is followed by abrupt rapid dimming. The two-stage dimming occurs in a pair of conjugate dimming regions adjacent to the two flare ribbons, and the flare onset marks the transition between the two stages of dimming. At the onset of the two-ribbon flare, transient brightenings are also observed inside the dimming regions, before rapid dimming occurs at the same places. These observations suggest that the CME structure, most probably anchored at the twin dimming regions, undergoes a slow rise before the flare onset, and its kinematic evolution has significantly changed at the onset of flare reconnection. We explore diagnostics of the CME evolution in the early phase with analysis of the gradual dimming signatures prior to the CME eruption.