低高度空间高能质子通量分布计算

介绍了AP-8模式、CRRESPRO模式和PSB97模式,并用这3种模式分别计算低高度空间300—1100km范围内的高能质子通量分布,由IDL软件绘出通量等值线图．AP-8模式通量主要受银河宇宙线调制,即受太阳活动直接影响,与太阳活动高年相比,太阳活动低年的质子通量较大;CRRESPRO模式中,因活动期和平静期的数据采集时间前后相差很短,从而使同一高度上两种环境条件下的通量分布相似．模式之间的比较结果表明,AP-8模式通量较小,CRRESFRO模式通量较大,PSB97模式通量介于二者之间,并与实测通量接近．PSB97是为低高度(1000km以下)定制的模式,在低高度上优于AP-8模式和CRRESPRO模式,能较好地计算当前条件下的低高度高能质子通量．

Calculation of Flux Distribution of Energetic Proton at Low Altitude Space

AP-8 model, CRRESPRO model and PSB97 model are introduced in this paper and used to calculate the flux distribution of energetic proton between low altitude 300 and 1100km, separately, and then the calculated flux distributions are plotted as contour graph by IDL software. AP-8 model flux is mainly modulated by galactic cosmic rays and is influenced directly by solar activity. Consequently, the proton flux is higher during the maximum part of the solar cycle than that during the minimum part. CRRESPRO model comprises conditions of active and quiet earth magnetic fields, which correspond to similar flux due to the short time difference of data collection at different earth magnetic conditions. Compared results between models show that AP-8 model flux is small, CRRESPRO model flux is large, and PSB97 model flux is between the two and is the nearest to the detected value. PSB97 model is compiled specially for low altitude (under 1000 kilometers) use and is applicable to calculate energetic proton flux at low altitude in current space environmental condition, significantly for prediction of energetic proton flux in SZ spacecraft orbit.