Abstract
The interpretation of the observed partial correlation between the meson intensity at sea level and the barometric pressure, the other independent variables of the regression equation being the height of the 100 mb level and the stratospheric temperature, is discussed. It is shown that even though the decay effect due to changes in the height of the meson-producing layer is represented by a separate term in the regression equation, the barometer term does not represent a pure absorption effect but contains also a contribution from the μ-e decay. This decay contribution is due to the relativistic time dilation which makes the mean life of a μ-meson in the atmosphere depend on its energy loss and thereby causes its survival probability to change with changing sea-level pressure even if the height of the meson-producing layer remains constant. The decay effect is found to constitute about one third of the barometric effect observed in experiments performed at sea level. The simple total correlation between the meson intensity and the sea-level pressure is also discussed.
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