MHD simulations of coronal dark downflows considering thermal conduction

ZURBRIGGEN, E.; COSTA, A.; ESQUIVEL, A.; SCHNEITER, M.; CÉCERE, M.

Cartagena de Indias

Congreso; Fine Structure and Dynamics of the Solar Atmosphere Proceedings IAU Symposium; 2016

 While several scenarios have been proposed to explain supra-arcade downflows(SADs) observed descending through turbulent hot regions, none of them have systematicallyaddressed the consideration of thermal conduction. The SADs are known to be voided cavities.Our model assumes that SADs are triggered by bursty localized reconnection events that pro-duce non-linear waves generating the voided cavity. These subdense cavities are sustained intime because they are hotter than their surrounding medium. Due to the low density and largetemperature values of the plasma we expect the thermal conduction to be an important process.Our main aim here is to study if it is possible to generate SADs in the framework of our modelconsidering thermal conduction. We carry on 2D MHD simulations including anisotropic ther-mal conduction, and find that if the magnetic lines envelope the cavities, they can be isolatedfrom the hot environment and be identified as SADs.