Abstract
RECORDS of the ionisation in a closed vessel, caused mainly by the cosmic ultra-radiation, have been obtained at Abisko in northern Sweden (lat. 68° 21′ N.) during two periods: October 1929–July 1930 and September 1932–July 19331. During the first period, a Kolhörster apparatus, placed within an iron shield 6–11 cm. in thickness (free opening upwards), was used ; during the second period, a Steinke apparatus, placed within a lead shield 10 cm. in thickness in all directions, was used. Every second fortnight the Steinke apparatus recorded, however, with the shield open upwards. The results of both periods have been compared with simultaneous observations of the auroræ boreales and also, for the first period, with the simultaneous magnetic records of the Geophysical Observatory of Abisko2.
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References
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CORLIN, A. Cosmic Ultra-radiation and Auroræ Boreales. Nature 133, 24–25 (1934). https://doi.org/10.1038/133024b0
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DOI: https://doi.org/10.1038/133024b0
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