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There is growing evidence that relativistic jets in active galactic nucleiundergo extended (parsec-scale) acceleration. We argue that, contrary to somesuggestions in the literature, this acceleration cannot be purely hydrodynamic.Using exact semianalytic solutions of the relativistic MHD equations, wedemonstrate that the parsec-scale acceleration to relativistic speeds inferredin sources like the radio galaxy NGC 6251 and the quasar 3C 345 can beattributed to magnetic driving. Additional observational implications of thismodel will be explored in future papers in this series.Comment: 6 pages, 2 figures, submitted to Ap

Magnetic Driving of Relativistic Outflows in Active Galactic Nuclei. I. Interpretation of Parsec‐Scale Accelerations