MODELS OF STATIONARY SIPHON FLOWS IN STRATIFIED, THERMALLY CONDUCTINGCORONAL LOOPS .2. SHOCKED SOLUTIONS

We use a detailed hydrodynamic model which takes into account the effe cts of gravity, of radiative losses, of thermal conduction and of a pa rametrized heating term to explore the conditions for the presence of stationary shocks in critical and supersonic siphon flows in coronal l oops. We consider separately isothermal and adiabatic shocks. The expl oration of the parameter space shows that in every solution, as charac terized by loop length, base dynamical pressure and base velocity, the shock position depends on the volumetric heating rate of the loop. In addition, with the exception of the critical solutions with isotherma l shocks, there exists a range of volumetric heating rates for which t here are two alternative positions where the shock can form. Scaling l aws for supersonic solutions are derived.