P-1a-33 1 The Day-night Variation of Cosmic Rays Intensity at Sea Level Under the Influence of Meteorological Fronts and Troughs

The cosmic rays (CR) at sea level comprise particles from the extensive air showers (EAS). Their major components are muons, which are the decay products of pions or kaons from high altitudes. Despite a lifetime of only about 2 µs, muons can penetrate the atmosphere down to the sea level before they decay because of the relativistic time dilation effect. When muons travel through the atmosphere, they lose their energy by the proces