Abstract
Sporadic ionization is defined as traces seen on h′f ionospheric records which show rapid or erratic variation in frequency or vertical height as compared with the normal region traces. Such records are quite common at northern Canadian stations. Four types of F-region sporadic ionization and five types of E-region ionization are described. Continuous sweeps taken at Baker Lake, Canada, illustrate the variation of some of these types of sporadic ionization. Estimates were made of the speeds of motion over the station of some of the sporadic “ionized clouds.” These in a few measurable cases ranged from 400 km per hour for clouds at 100 km virtual height to 1,200 km per hour for clouds at 300 km virtual height.
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