We synthesize profiles of the infrared line Fe I 15648.5 Angstrom (g =
3) for a recently developed theoretical model of siphon flows along p
hotospheric magnetic loops. The synthesized line profiles are compared
with; the observations from which Ruedi et al. (1992) deduced the pre
sence of such flows across the neutral line of an active region plage.
This comparison supports the interpretation of Ruedi et al. (1992). I
t also suggests that the average footpoint separation of the observed
loops carrying the siphon flow is 8-15'' and that the siphon flow expe
riences a standing tube shock in the downstream leg near the top of th
e arch.