New results of cosmic‐ray research

Abstract

Continuous registrations of the cosmic‐ray ionization by Steinke's standard apparatus at elevations above sea‐level of 2300 and 600 meters (Hafelekar and Innsbruck) kept at constant temperature from 1931 to 1934 and in 1936 have brought interesting results. Among these, for instance, the existence of a regular, small diurnal variation according to solar time has been established 1 . Recently one of my collaborators, W. Illing, 2 tested the existence of diurnal variation according to sidereal time as postulated by A. H. Compton's theory of the extra‐galactic origin of the cosmic radiation. The curve derived from 21,000 hourly observations in three years showed a certain resemblance to Compton's theoretical curve, which however disappeared when all observations were reduced to the same outdoor temperature.