Determination of the pressure coefficients for neutron monitor and multiplicity analyzer measurements

To determine the air pressure dependence of the total rates of the neutron monitor NM-64 and of the observed multiplicities 1, 2, 4 and 6 of the neutron multiplicity analyzer the one-station method with iterative least squares described by Martinelle (1968) is used. This method is extended with a criterion for optimizing the length of the filter taken from Jenkins and Watts (1969). To show the effect of this method also classical regression estimates are given. Pressure coefficients are obtained for overlapping periods of three months for the greater part of the years 1970–1974.