Cosmic-ray intensity-time variations recorded in the lower atmosphere by one neutron detector (D-1, Climax, Colorado) and three ionization detectors (Freiburg, Germany; Cheltenham, Maryland; and Huancayo, Peru) are compared. Irregular intensity variations characterized by time parameters of 27 days and 24 hours are shown to occur in coincidence in the records of both types of detectors. It seems reasonable to ascribe correlated neutron and ionization intensity variations to a common origin.It has been shown that 27-day neutron intensity variations are produced by primary intensity variations. The magnitude of these variations must be greater for low energy primaries as 27-day neutron intensity variations at Climax are ≈5 times larger than corresponding ionization intensity variations at Freiburg, Cheltenham, and Huancayo. These variations must extend, however, to high energy primaries, as their effects are observed at the geomagnetic equator. From the ≈5:1 relative response (Climax neu

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51 relative response climax correlated neutron and ionization intensity variations ionization detectors primaries

William H. Fonger,.Cosmic Radiation Intensity-Time Variations and Their Origin. II. Energy Dependence of 27-Day Variations. 91 (2),351–361.

William H. Fonger,"Cosmic Radiation Intensity-Time Variations and Their Origin. II. Energy Dependence of 27-Day Variations" 91

William H. Fonger,"Cosmic Radiation Intensity-Time Variations and Their Origin. II. Energy Dependence of 27-Day Variations"