DEPENDENCE OF THE COSMIC MUON FLUX ON ATMOSPHERIC PRESSURE AND TEMPERATURE

Abstract

The dependence upon atmospheric pressure of the cosmic muon flux in Hanoi has been measured to be -1.47± 0.50 permil per mbar in agreement with expectation from a naive estimate. The dependence over ground temperature is observed to largely reflect the correlation existing between temperature and pressure. Once the effect of this correlation is removed a smaller, barely significant temperature dependence of -0.57± 0.34 permil per °C subsists.