Inclusive dijet photoproduction and the resolved photon at THERA

A future $ep$ facility, THERA, where electrons of 250 GeV and protons of 920 GeV are collided could provide valuable information on the structure of the photon. With an increase in the centre-of-mass energy of a factor of 3 and an extension of the minimum photon energy fraction carried by the interacting parton of a factor of 10 compared to HERA, a new kinematic regime in the study of the photon will be opened. Inclusive dijet production has been studied and the potential gains the new collider would bring are discussed. The differences between current parametrisations of the photon structure in this new kinematic region are shown to be up to 50%. Comparisons of THERA's capabilities are made with what HERA can currently produce and how it complements $e^+e^-$ colliders addressed.