Variations in cosmic radiation intensity associated with the barometric effect

Abstract

The barometric effect for the Mexico City neutron monitor is obtained from cosmic ray intensity data obtained during the years 1990-1997, more than half a solar cycle, by correlation between the neutron intensity and the atmospheric pressure. In order to eliminate other factors of solar or geomagnetic origin we use only geomagnetically quiet days (kp<20°). The evolution of the barometric coefficient from maximum (1990) to minimum (1997) solar activity is discussed.