ANTI-STURMIAN SLOW DISCRETE MODES MODELING LONG-PERIOD LOOP PROMINENCE OSCILLATIONS

The slow magnetosonic waves can, under certain conditions, have a disc rete set of regular eigenmodes similar to the discrete Alfven wave sqe ctrum (Sturmian or anti-Sturmian). The latter were shown to explain th e short period (2-8 min) prominence loop oscillations as a global Alfv en modes. Here, we slow that the anti-sturmian discrete slow wave spec trum can explain the long period (24-84 min) oscillations of solar loo p prominences. we have also estimated the Q(Q(-1) = I-m omega/omega) f actor, due to electron and ion Cherenkov damping, for the loop cavity, and found the value of Q similar to 6 which is compatible with the ob servations of loop period oscillation and life time.