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Centrifugal acceleration of charged test particles at the base of a rotatingjet magnetosphere is considered. Based on an analysis of forces we derive theequation for the radial accelerated motion and present an analytical solution.It is shown that for particles moving outwards along rotating magnetic fieldlines, the energy gain is in particular limited by the breakdown of thebead-on-the-wire approximation which occurs in the vicinity of the lightcylinder $r_{L}$. The corresponding upper limit for the maximum Lorentz factor$\gamma_{max}$ for electrons scales $\propto B^{2/3} r_{L}^{2/3}$, with $B$ themagnetic field strength at $r_{L}$, and is at most of the order of a$10^2-10^3$ for the conditions regarded to be typical for BL Lac objects. Suchvalues suggest that this mechanism may provide pre-accelerated seed particleswhich are required for efficient Fermi-type particle acceleration at largerscales in radio jets.Comment: 4 pages, 1 figure; to appear in the Proc. of the Heidelberg  International Symposium on High Energy Gamma-Ray Astronomy, Heidelberg, June  26-30, 2000, ed. by H.J. Voelk and F. Aharonian, AIP Conf. Pro

Test particle acceleration by rotating jet magnetospheres