2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/4661We discuss processes accelerating cosmic ray electrons at boundaries of relativistic jets. The resulting spectrum is expected to posses two characteristic components: a power-law distribution at lower energies and a harder high energy component preceding the high energy cut-off. An example of high energy spectrum from such electron distribution is presented, including the synchrotron and the inverse-Compton components. A characteristic feature of the synchrotron spectrum of such electrons is its highest frequency part which occurs above the power-law fitted to the low frequency spectral range.4 pages, 1 figure included. Proceedings of the Workshop `Blazar Astrophysics with BeppoSAX and other Observatories', Frascati, Dec. 2001Astrophysicstext