Astronomy and Astrophysics – Astrophysics
Scientific paper
Aug 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995a%26a...300..549o&link_type=abstract
Astronomy and Astrophysics, v.300, p.549
Astronomy and Astrophysics
Astrophysics
24
Mhd, Sun: Chromosphere, Sun: Corona
Scientific paper
We use a detailed hydrodynamic model which takes into account the effects of gravity, of radiative losses, of thermal conduction and of a parametrized heating term to explore the conditions for the presence of stationary shocks in critical and supersonic siphon flows in coronal loops. We consider separately isothermal and adiabatic shocks. The exploration of the parameter space shows that in every solution, as characterized 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 isothermal shocks, there exists a range of volumetric heating rates for which there are two alternative positions where the shock can form. Scaling laws for supersonic solutions are derived.
Orlando Salvatore
Peres Giovanni
Serio Salvatore
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