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A single measurement of linear polarization of a nonthermal source providesdirect information about the mean direction and level of ordering of themagnetic field. Monitoring of the polarization in blazars, combined withmillimeter-wave VLBI imaging in both total and polarized intensity, has thepotential to determine the geometry of the magnetic field. This is a key probeof the physical processes in the relativistic jet, such as ordered fieldcomponents, turbulence, magnetic reconnections, magnetic collimation andacceleration of the jet flow, particle acceleration, and radiative processesthat produce extremely luminous, highly variable nonthermal emission.Well-sampled monitoring observations of multi-waveband flux and radio-opticalpolarization of blazars show a variety of behavior. In some cases, the observedpolarization patterns appear systematic, while in others randomness dominates.Explanations involve helical magnetic fields, turbulence, and perhaps particleacceleration that depends on the angle between the magnetic field and shockfronts that might be present. Simulations from the author's TEMZ model, withturbulent plasma crossing a standing conical shock in the jet, show that amixture of turbulent and toroidal magnetic field can produce the level ofpolarization variability that is observed, even when the two field componentsare roughly equal.

Time-Variable Linear Polarization as a Probe of the Physical Conditions in the Compact Jets of Blazars