NUMERICAL SIMULATIONS OF SPICULE DRIVING MECHANISMS

Spicules are known as one of the most prevalent small-scale dynamic ph enomena on the sun, which are likely to give considerable contribution to coronal heating and mass supply. We discuss a model of the spicule s driven by a train of slow MHD shock waves propagating along a vertic al expanding magnetic flux tube. The shocks are initiated due to compr ession of the tube by the increasing external pressure in the lower ch romosphere. Downflow of spicular material depends on radiative cooling and other dissipative processes.