... These relate to a general enhancement of auroral intensity within this region (Snyder and Akasofu, 1976; Shepherd et al., ... The auroral activity consists often of separate bright spots with uniform spacing, estimated to be about 1.5 hours of local time by Lui et al. ... Cogger, L. L., J. S. Murphree, S. Ismail, and C. D. Anger, Characteristics of dayside 5577 A and 3914 A aurora, Geophys. ... Lui, A. T. Y., D. Venkatesan, and J. S. Murphree, Auroral bright spots on the dayside oval, J. Geophys. ...