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We study the properties of the innermost jet of the flat spectrum radioquasar 1633+382 (4C~38.41) based on VLBI data from the radio monitoringobservations of the Boston University VLBI program at 43~GHz. Analysis of thecomponents suggests a semi-parabolic jet geometry with jet radius $R$ followingthe relation $R\propto r^{0.7}$ with distance $r$, with indications of a jetgeometry break towards a conical geometry. Brightness temperature falls withdistance following $T_B\propto r^{-2.1}$. Combining this information, magneticfield and electron densities are found to fall along the jet as $B\proptor^{-1.5}$ and $n\propto r^{-1.1}$ respectively, suggesting that the magneticconfiguration in the jet may be dominated by the poloidal component. Ouranalysis of the jet structure suggests that the innermost jet regions do notfollow a ballistic trajectory and, instead, match a sinusoidal morphology whichcould be due to jet precession from a helical pattern or Kelvin-Helmholtzinstabilities.

Exploring the Morphology and Origins of the 4C 38.41 Jet