Solar Active Region:Heating and Dynamics

L Harra-Murnion, S Matthews, H Hara, K Ichimoto
It has been frequently observed that in solar active regions the measured line widths are larger than those based on thermal equilibrium widths. This excess width characterised as non-thermal velocity, V nt has been proposed as a signature of the heating mechanism. We analyse the diierence in V nt and dynamics of the hot 1MK loops and cool 1MK loops.