THE DISTRIBUTION OF RADIO-AURORA IN CENTRAL CANADA

Five bistatic v.h.f. radio systems were operated in central Canada during the I.G.Y. for the purpose of detecting auroral ionization. Consistent records were obtained for a period of 5 months and these records have now been analyzed. Two types of events were detected. The nighttime (A) events occur most frequently in the auroral zone and characteristically are observed simultaneously at two points separated by about 300 kilometers. The daytime (5) events occur simultaneously over a much larger area. The time of maximum occurrence of A events becomes later with decreasing latitude whereas the reverse is true for S events. The variation with latitude of the occurrence of A events is similar to that of other auroral phenomena.