Abstract
The solar-cycle variation of the attenuation coefficient of the intensity recorded by the IGY neutron monitors is synoptically studied by regression analysis on daily data of 21 stations using 3-month periods from 1957 to 1965. A combined technique of reducing and filtering the data is applied before performing the least-square analysis, in order to minimize the influence of primary and instrumental changes and to work towards optimal estimates. Values suitable for appropriate correction of the station data for pressure changes are generally found over the whole range of latitudes, altitudes and times. However, a quantitative estimate of the typical peak-to-peak amplitude of the solar-cycle change is reached only at high latitudes near sea level, where data from several stations under similar geophysical conditions are available and the effect is the largest. Here an average variation of about 4 percent is obtained, in agreement with an independent estimate of the effect.
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