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Analytical model for estimating the zenith angle dependence of terrestrial cosmic ray fluxes

Sato, Tatsuhiko   

A new model called PARMA4.0 was developed to facilitate instantaneous estimation of not only omnidirectional but also angular differential fluxes of cosmic rays anywhere in Earth's atmosphere at nearly any given time. It consists of its previous version, PARMA3.0, for calculating the omnidirectional fluxes and several mathematical functions proposed in this study for expressing their zenith-angle dependences. The numerical values of the parameters used in these functions were fitted to reproduce the results of the extensive air shower simulation performed by Particle and Heavy Ion Transport code System (PHITS). The accuracy of PARMA4.0 was closely verified using multiple sets of experimental data obtained under various global conditions. This extension enlarges the model's applicability to more areas of research, including design of cosmic-ray detectors, muon radiography, soil moisture monitoring, and cosmic-ray shielding calculation.

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Category:Multidisciplinary Sciences

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