title: Probes of the inner jets of blazars.
abstract: I review models for the "inner jet" in blazars, the section that connects the central engine with the radio jet. I discuss how the structure and physics of the inner jet can be explored using millimeter-wave VLBI (very-long-baseline radio interferometry) as well as multiwaveband observations of blazars. Flares at radio to gamma-ray frequencies should exhibit time delays at different wavebands that can test models for both the high-energy emission mechanisms and the nature of the inner jet in blazars.
authors.affiliation: Department of Astronomy, Boston University, Boston, MA 02215, USA.
authors.forename: A P
authors.initials: AP
authors.lastname: Marscher