由大气密度的季变化所造成的中、低层大气电离率的季变化

本文对CIRA 1972 模式下的中、低层大气密度季变化所造成的电离率的季变化作了理论计算, 利用宇宙线电离源函数对全球中、低层大气的电离率作了数值计算.计算结果表明, 在70km以下的大气电离率的季变化幅度为百分之几十.在电离峰值高度(约15km)以下幅度为约百分之十, 高度越高变幅越大, 到70km处达35%.在20km以上电离率的季变化趋势与大气密度的季变化趋势大致相同, 夏季比冬季大, 20km以下变化稍为复杂. 

Seasonal Variations of Atmospheric Ionization Rates in Low and Middle Atmosphere Produced by the Seasonal Variations of Atmospheric Densities

In this paper calculations of the seasonal variation of atmospheric ionization rate in low and middle atmosphere produced by the seasonal variation of atmospheric density in CIRA 1972 are conducted. Cosmic ray ionization source functions are used to numerically calculate the ionization rate in the low and middle atmosphere of the whole globe. The results show that the order of the amplitudes of seasonal functions of the atmospheric ionization rate at altitudes below 70 km are several tens percent. Below the altitude of ionization peak (about 15km), the amplitude as about 10%, the higher the altitudes, the larger the amplitudes, and it will reach 35% at 70 km. Above 20 km the seasonal variations of ionization rates are glossly proportional to that of atmospheric densities, being larger in summer than in winter. Below 20 km, the situation is more complicated.