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: Magnetic fields of natural origin in the 5 to 20 c.p.s. frequency range were recorded in Kingston, R. I. The experimental equipment is described briefly, and results are presented. Variations with time of the first resonant frequency of the earth-ionosphere cavity are indicated, and effects of solar activity are discussed. An analysis of the envelope of recorded wave trains shows only fair agreement with existing theory. (Author)

Schumann resonances of the earth-ionosphere cavity - extremely low frequency reception at Kingston, R.I