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Report No.

Cosmic ray modulation and radiation dose of aircrews during the solar cycle 24/25

Miyake, Shoko*; Kataoka, Ryuho*; Sato, Tatsuhiko

Weak solar activity and high cosmic-ray flux during the coming solar cycle are qualitatively anticipated by the recent observation that show the decline in the solar activity levels. We have quantitatively predicted the cosmic-ray modulation and resultant radiation exposure at flight altitude by using the time-dependent and three dimensional model of the cosmic-ray modulation. The database of airshower simulation performed by Particle and Heavy Ion Transport code System, PHITS, was employed in the prediction. Our predictions of the neutron monitor counting rate and the radiation dose of aircrews during the solar cycle 24/25 have some natures caused by the charge sign dependence of the cosmic-ray modulation, such as the flat-top profiles.



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Category:Astronomy & Astrophysics



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