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Imaging evidence for plasma outflows originating in a dimming region associated with an eruption of a quiescent filament

Juraj Lorincik - Astronomical Institute of the Czech Academy of Sciences, Czech Republic; Jaroslav Dudik - Astronomical Institute of the Czech Academy of Sciences, Czech Republic; Guillaume Aulanier - LESIA, Observatoire de Paris, France; Brigitte Schmieder - LESIA, Observatoire de Paris, France; Leon Golub - Harvard-Smithsonian Center for Astrophysics, United States

Session: Interplanetary CMEs and Solar Particle Events


We report on the Atmospheric Imaging Assembly (AIA) observations of plasma outflows originating in a coronal dimming during the 2015 April 28th filament eruption. After the filament started to erupt, two flare ribbons formed, one of which had a well-visible hook enclosing a core dimming region. Along multiple funnels located in the dimming, outward-directed motions of plasma started to be discernible in time-distance diagrams produced using the 171 and 193 filter channel data. There, the motions generated a strip-like pattern which lasted for more than five hours and which characteristics did not change along the funnel. We suggest the motion to be a signature of outflows, with velocities of 70 to 140 km/s. Interestingly, the pattern generated by the outflows and their velocities were found to be similar to those we observed in an ordinary coronal hole located in the vicinity. The outflows were therefore most likely related to a CME-induced slow solar wind flowing along the open-field structures of the dimming region. To our knowledge, our observations present the first imaging evidence for outflows of plasma from a dimming region.

Approaching deadlines:

Registration opens:

16 July 2020

Abstract submission opens:

16 July 2020

European Space Weather Medals:

6 September 2020

Registration deadline:

25 September 2020

Registration deadline: [extended]

10 October 2020

Abstract submission deadline:

4 September 2020