Abstract
EXTRATERRESTRIAL radio ‘noise’ has been intensively studied during the past decade. The steady background radiation or ‘cosmic noise’ from interstellar space has been observed1 at frequencies down to about 1 Mc./s. and an intensity of about 10−19 watts per square meter per cycle per second (W.m.−2 (c./s.)−1). Ellis2 later showed that cosmic noise at lower frequencies could not penetrate the earth's magneto-ionic upper atmosphere. Reber3, however, reported observations of steady noise of intensity 10−22 W.m.−2 (c./s.)−1 at frequencies of 520 kc./s. and 140 kc./s. This appeared to be correlated with sidereal time and so was claimed to be cosmic noise.
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References
Reber, G., and Ellis, G. R., J. Geo. Res., 61, 1 (1956).
Ellis, G. R., J. Atmos. Terr. Phys., 9, 51 (1956).
Reber, G., J. Geo. Res., 63, 109 (1958).
Ellis, G. R., Plan. Space Sci. (in the press).
Ellis, G. R., J. Atmos. Terr. Phys., 10, 302 (1957).
Duncan, R. A., and Ellis, G. R., Nature, 183, 1618 (1959).
Dowden, R. L., J. Atmos. Terr. Phys. (in the press).
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DOWDEN, R. Low-frequency (100 kc./s.) Radio Noise from the Aurora. Nature 184, 803 (1959). https://doi.org/10.1038/184803a0
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DOI: https://doi.org/10.1038/184803a0
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