Exploring the Morphology and Origins of the 4C 38.41 Jet
  We study the properties of the innermost jet of the flat spectrum radio
quasar 1633+382 (4C~38.41) based on VLBI data from the radio monitoring
observations of the Boston University VLBI program at 43~GHz. Analysis of the
components suggests a semi-parabolic jet geometry with jet radius $R$ following
the relation $R\propto r^{0.7}$ with distance $r$, with indications of a jet
geometry break towards a conical geometry. Brightness temperature falls with
distance following $T_B\propto r^{-2.1}$. Combining this information, magnetic
field and electron densities are found to fall along the jet as $B\propto
r^{-1.5}$ and $n\propto r^{-1.1}$ respectively, suggesting that the magnetic
configuration in the jet may be dominated by the poloidal component. Our
analysis of the jet structure suggests that the innermost jet regions do not
follow a ballistic trajectory and, instead, match a sinusoidal morphology which
could be due to jet precession from a helical pattern or Kelvin-Helmholtz
instabilities.
