Observations of cosmic radio-frequency radiation on frequencies of 2130 kc/sec, 1435 kc/sec, 900 kc/sec, and 520 kc/sec have been made, using a method of recording which effectively reduces interference from atmospherics. At these frequencies, the intensity of the radiation is approximately 10−19 watt per square metre per cycle per second per steradian. The ionospheric effects associated with observations near the critical frequency are discussed.
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Reber et al. (1956) studied this question.