Cosmic Radiations at 5 Metres Wave-length

Details Cosmic Radiations at 5 Metres Wave-length Cosmic Radiations at 5 Metres Wave-length

Mar 1946

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1946natur.157..296h&link_type=abstract

Nature, Volume 157, Issue 3984, pp. 296-297 (1946).

Physics

11

Scientific paper

THE discovery of electromagnetic `noise' radiations at radio frequencies was first made by K. G. Jansky1 who, in a series of measurements at about 20 Mc./s. (λ ~, 15 m.) was able to establish the close connexion between the direction of greatest intensity and the centre of the galaxy. G. Reber2 later made measurements at 160 Mc./s. (λ ~ 2 m.), and he was able, by virtue of a narrower beam, to detect a number of subsidiary peaks. He found the intensity of radiation at this higher frequency was very much less ; he also suggested a probable explanation of the radiations, namely, the interactions in encounters between positive ions and free electrons released from interstellar gases by the photo-electric action of stellar radiations. The theoretical treatment for radiation arising from such encounters was first given by H. A. Kramers3 to account for continuous radiation in X-ray spectra. The cosmic noise radiation is not observable at frequencies lower than a few megacycles per second, owing to the screening action of the ionosphere.

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