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Whistler‐like pulsation events in the frequency range 20 to 200 Hz
Author(s) -
Heacock R. R.
Publication year - 1974
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/gl001i002p00077
Subject(s) - whistler , daytime , quiet , physics , range (aeronautics) , atmospheric sciences , event (particle physics) , hiss , astrophysics , meteorology , environmental science , astronomy , plasma , materials science , nuclear physics , composite material , electron
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.