Cleft region electric fields and ionospheric observations are used to calculate cleft currents and their magnetic fields, which are compared with ground-based magnetic observations. Rockets were launched through the postnoon cleft region from Cape Parry, Northwest Territories, Canada, on November 25 and 28, 1975. They carried energetic particle detectors, electrostatic analyzers, an electron spectrometer, and shaped charges with barium liners to determine the electric fields, electron energy flux, and energetic particles (>70 keV). Bottomside and Isis 1 and 2 topside ionograms, all-sky photographs, and visual observations of aurora are used to determine empirical models of the cleft ionosphere. The conductivities of these ionospheric models, are calculated and are then combined to form representative cross sections of the cleft region during the rocket flights. Currents are calculated from the electric fields and ionosheric models, and then their magnetic fields are determined and compared with the observations. Because most of the east-west electrojets are in oppositely flowing pairs, their magnetic fields cancel at the earth's surface. Currents flowing in the meridional plane are completed by field-aligned currents flowing outward above the arcs and inward at discontinuities in the ionosphere or electric field. Some of the field-aligned currents above the arcs could exceed the critical current of the topside ionosphere and possibly cause instabilities in these regions, which could in turn energize the auroral particles.