Ultra-violet Rays and Their Variations

Details Ultra-violet Rays and Their Variations Ultra-violet Rays and Their Variations

Aug 1941

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1941natur.148..225a&link_type=abstract

Nature, Volume 148, Issue 3747, pp. 225-226 (1941).

Mathematics

Probability

Scientific paper

WIRELESS operators have observed that the strength of signals received by them from distant stations varies from time to time. There is a secular variation which Sir Edward Appleton has shown coincides in general with the solar cycle1; there is an annual variation depending on the season; and there is a daily variation in which sunrise and sunset play a prominent part. These variations are, with high probability, effects of the ionization of the upper atmosphere and this ionization is, in its turn, produced by the ultra-violet rays from the sun. Observations of ultra-violet rays are of considerable interest in this connexion and have been carried on in one or two places for a number of years.

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