摘要: To facilitate the use of cosmic-ray intensity data from ionization chambers which are being sent to International Geophysical Year World Data Centers, and those have appeared in two publications Carnegie Institution Washington, an improved correction for instrumental drift at Huancayo is derived reliability corrections seasonal variations discussed. From chambers, decrease its maxima (near sunspot minima) shown lag a year or more behind increase solar activity following minima. This does not appear results obtained by Neher high altitude latitude, nor Rose neutron monitor Ottawa. The variability daily means (from monthly means) 1957 largest observed during complete cycles. Tables corrected wave included, together with graphs period 1954–1957.