Geomagnetic Noise at 230 kc./s.

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GEOMAGNETIC radio noise or ‘hiss’ usually occurs only in the audio region. During severe magnetic storms it has been reported up to 30 kc./s. on a sweep frequency analyser1 and at 70 and 180 kc./s. on fixed tuned channels2. The latter report2 was written after the records had been destroyed in a fire. New observations at up to 230 kc./s. are described here.

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    Ellis, G. R., Plan. Space Sci., 1, 253 (1959).

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    Dowden, R. L., Nature, 184, 803 (1959).

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    Marshall, L., Astrophys. J., 124, 469 (1956).

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    Helliwell, R. A., “Low Frequency Propogation Studies, Part 1”, ASTIA Document No. AD110184 (1958).

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    Maeda, K., and Kimura, I., Rep. Ionos. Res. Japan, 10, 105 (1956).

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

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DOWDEN, R. Geomagnetic Noise at 230 kc./s.. Nature 187, 677–678 (1960) doi:10.1038/187677a0

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