Chromospheric plasma ejection above a pore

Abstract

We present high spatial resolution observations of short lived transients, ribbon and jets like events above a pore in Ca II H images where fine structure like umbral dots, lightbridge and penumbral micro filaments are present in the underlying photosphere. We found that current layers are formed at the edges of convective fine structure due to the shear between their horizontal field and the ambient vertical field. High vertical electric current density patches are observed in the photosphere around these events which indicates the formation of a current sheet at the reconnection site. In the framework of past studies, low altitude reconnection could be the mechanism that produces such events. The reconnection is caused by an opposite polarity field produced by the bending of field lines by convective downflows at the edge of the pore fine structures.

arXiv comment10 pages, 5 figures, accepted for publication in MNRAS

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Cited by in corpus (4)

• Solar jets observed with the Interface Region Imaging Spectrograph (IRIS)
• Umbral chromospheric fine structure and umbral flashes modelled as one: the corrugated umbra
• Oscillations In The Line-of-Sight Magnetic Field Strength In A Pore Observed By The GREGOR Infrared Spectrograph (GRIS)
• Fan-shaped jet close to a light bridge