Abstract
If the lower limit of frequencies, of interest to this Institute, is somewhat arbitrarily set at 0.001 cps, the central octave of the band falls between 1 and 2 cps. Our colleague, Sir Charles Wright, has often referred to this region as a “no man’s land.” The name is appropriate. It lies near the crossover between ionospheric and tropospheric background noise sources, and it roughly marks the practical transition from DC to AC types of receiving equipment. The lower limit has been chosen because, with some notable exceptions, instruments responding to periods much greater than 1,000 seconds are rarely sensitive enough to observe the background at a few seconds period. In any event, the background at lower frequencies is adequately covered by instrumentation now used by magnetic observatories. These measurements have been well described in the literature and, thus, are not included in this paper.
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Lokken, J.E. (1964). Instrumentation for Receiving Electromagnetic Noise below 3,000 Cps. In: Bleil, D.F. (eds) Natural Electromagnetic Phenomena below 30 kc/s. Springer, Boston, MA. https://doi.org/10.1007/978-1-4899-6425-0_18
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