Gradual Solar Coronal Dimming and Evolution of Coronal Mass Ejection in the Early Phase
| Autor: | Jiong Qiu, Jianxia Cheng |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2017 |
| Předmět: |
010504 meteorology & atmospheric sciences
genetic structures Astrophysics::High Energy Astrophysical Phenomena education FOS: Physical sciences Astrophysics 01 natural sciences Two stages law.invention law 0103 physical sciences Coronal mass ejection Astrophysics::Solar and Stellar Astrophysics skin and connective tissue diseases 010303 astronomy & astrophysics Solar and Stellar Astrophysics (astro-ph.SR) 0105 earth and related environmental sciences Physics Solar flare Mathematics::Commutative Algebra Astronomy and Astrophysics Magnetic reconnection Astrophysics - Solar and Stellar Astrophysics Space and Planetary Science Coronal plane Physics::Space Physics sense organs Early phase Flare |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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