Abstract
OUR new researches on the penetrating radiation in the region of the Jungfrau have now reached a partial conclusion. As is well-known, the existence of this radiation was proved by balloon observations in the years 1909–1914, and, in particular, their extraordinary hardness, which pointed to a cosmic source, was then established by Kolhörster. Afterwards, Nernst in 1921 suggested that their origin lies in recently formed matter. Our researches in 1923–1924 did, in fact, give indications of a sidereal periodicity of intensity of the radiation. These variations can now be closely followed with our more sensitive instruments. It appears that the radiation reaches maximum intensity when certain celestial regions culminate, for example, the Milky Way, and specially the regions of Andromeda and of Hercules. This is explicable as a consequence of the minimum length of the path of rays from these regions through our atmosphere at culmination. The measurements were made at different stations on the Jungfrau up to heights of 14,000 feet, and on the Mönch peak at 13,500 feet above sea-level. Glacier ice was in general used as screening material.
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KOLHÖRSTER, W., VON SALIS, G. Variation of Penetrating Radiation on the Jungfrau. Nature 118, 518 (1926). https://doi.org/10.1038/118518c0
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DOI: https://doi.org/10.1038/118518c0
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