“…Its flow incident on the Earth's atmosphere is basically modulated by three processes: 1) Variations of the solar wind within the heliosphere (with time scale 10 to 1,000 years); 2) Variations of the Earth's magnetic field (100 -10,000 years); 3) Variations of the interstellar flow outside the heliosphere (>106 years) [12]. Variations with short periods of time and with a terrestrial origin are called seasonal and diurnal variations, caused by differences in the Earth's atmospheric structure between the winter and summer seasons, and between the day and night [13]- [15]. Other variation of the cosmic radiation, with a climatic origin, but with glacial periods, is due to orbital parameters.…”