Low-frequency (100 kc./s.) Radio Noise from the Aurora

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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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  1. 1

    Reber, G., and Ellis, G. R., J. Geo. Res., 61, 1 (1956).

  2. 2

    Ellis, G. R., J. Atmos. Terr. Phys., 9, 51 (1956).

  3. 3

    Reber, G., J. Geo. Res., 63, 109 (1958).

  4. 4

    Ellis, G. R., Plan. Space Sci. (in the press).

  5. 5

    Ellis, G. R., J. Atmos. Terr. Phys., 10, 302 (1957).

  6. 6

    Duncan, R. A., and Ellis, G. R., Nature, 183, 1618 (1959).

  7. 7

    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) doi:10.1038/184803a0

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