SHORT-PERIOD OSCILLATIONS IN THE EARTH'S ELECTROMAGNETIC FIELD.
APL library bulletin translations series,
JOHNS HOPKINS UNIV SILVER SPRING MD APPLIED PHYSICS LAB
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Short-period oscillations of the earths electromagnetic field with periods of 1-500 sec are of two basic types regular, almost-sinusoidal oscillations of a persistent nature, and irregular, erratic oscillations. Some regularities are established for changes in the period spectrum of these oscillations as a function of storm intensity. Short-period oscillations connected with bremsstrahlung from energetic electrons incident in the upper atmosphere are described. The mean regularity of excitation of the small-period oscillations is compared with regularities in the occurence of luminous atmospherics. It is found that in the case of similar diurnal, annual and cyclic variations small-period oscillations and F-scattering appeared simultaneously in only 40-50 of the cases at the middle latitudes.
- Atmospheric Physics