  UV spectra of the magnetic accretor AO Psc show absorption features for half
the binary orbit. The absorption is unlike the wind-formed features often seen
in similar stars. Instead, we attribute it to a fraction of the stream that
overflows the impact with the accretion disk. Rapid velocity variations can be
explained by changes in the trajectory of the stream depending on the
orientation of the white-dwarf's magnetic field. Hence we are directly
observing the interaction of an accretion stream with a rotating field. We
compare this behavior to that seen in other intermediate polars and in SW Sex
stars.
