Ernesto Zurbriggen
Numerical MHD modelling of Supra-Arcade Downflows
Supra-Arcade Downflows (SADs) are infrequent, wiggly, and low-emission structures observed to descend through the bright coronal plasma resembling the motions of tadpoles. SADs have always been detected after long-term erupting solar flares in EUV and soft X-ray wavelengths. Based on their physical characteristics, SADs have been interpreted as low-density bubbles and are related with fast magnetic reconnection processes. Despite the fact that several models of SADs have been proposed, the SAD origin and dynamics are not completely understood yet. Therefore, the triggering mechanism of SADs remains a topic open to further discussion.
In this talk, I will present our last numerical MHD scenario of SADs, where we assess whether spontaneous magnetic-reconnection outflows produced in a current sheet are able to drive descending, low-emission structures compatible with SADs in accordance with the retracting flux tube model.
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Friday
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Numerical MHD modelling of Supra-Arcade Downflows