EVIDENCE FOR SIPHON FLOWS WITH SHOCKS IN SOLAR MAGNETIC-FLUX TUBES

We synthesize profiles of the infrared line Fe I 15648.5 Angstrom (g = 3) for a recently developed theoretical model of siphon flows along photospheric magnetic loops. The synthesized line profiles are compared with; the observations from which Ruedi et al. (1992) deduced the presence of such flows across the neutral line of an active region plage. This comparison supports the interpretation of Ruedi et al. (1992). It also suggests that the average footpoint separation of the observed loops carrying the siphon flow is 8-15'' and that the siphon flow experiences a standing tube shock in the downstream leg near the top of the arch.