Abstract
A class of events, sweeping down in frequency, occurring between 20 and 200 Hz, were observed for the first time. The observing site is at Poker Flat, Alaska, 65°N. Characteristics include a daytime diurnal maximum, an apparent seasonal minimum in winter, a tendency for maximum occurrences on magnetically quiet days, and a typical event duration of ∼1 minute. The events occur at the same frequencies as a type of hiss observed on OGO‐5 (Kivelson and Russell, 1973) and a class of events observed on Injun 5 called ‘lion's roar’ (Gurnett and Frank, 1972), but the spectral form of the events observed on the ground is quite different from either of those types.
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