大气电子沉降电离：CRAC：EPII模型与参数化模型的比较
Atmospheric ionization induced by precipitating electrons: Comparison of CRAC:EPII model with parametrization model
摘要：
本文提出了一个新的宇宙线大气级联-电子沉淀诱导电离模型CRAC：EPII（Cosmic Ray Atmospheric Cascade：Electron Precipitation Induced Ionization）。CRAC：EPII是基于对地球大气中沉淀电子传播和与物质相互作用的蒙特卡罗模拟。它明确地考虑了能量沉积：电离，对产生，康普顿散射，产生韧致辐射高能光子，光电离和湮灭的正电子，多次散射相应的物理过程。利用GEANT 4模拟工具PLANETOCOSMICS程序，采用NRLMSISE 00大气模式，模拟了沉降电子的传播及其与大气分子的相互作用。电离产率进行了比较与分析参数化的各种能量的入射沉淀电子，使用单能量粒子的通量。两个模型之间的一个很好的协议是实现。随后，根据2002年10月30日和2004年1月7日的气球沉降电子谱，利用CRAC：EPII模型估算了中高层大气离子产生率
英文摘要：
A new model CRAC:EPII (Cosmic Ray Atmospheric Cascade: Electron Precipitation Induced Ionization) is presented. The CRAC:EPII is based on Monte Carlo simulation of precipitating electrons propagation and interaction with matter in the Earth atmosphere. It explicitly considers energy deposit: ionization, pair production, Compton scattering, generation of Bremsstrahlung high energy photons, photo-ionization and annihilation of positrons, multiple scattering as physical processes accordingly. The propagation of precipitating electrons and their interactions with atmospheric molecules is carried out with the GEANT4 simulation tool PLANETOCOSMICS code using NRLMSISE 00 atmospheric model. The ionization yields is compared with an analytical parametrization for various energies of incident precipitating electron, using a flux of mono-energetic particles. A good agreement between the two models is achieved. Subsequently, on the basis of balloon-born measured spectra of precipitating electrons at 30.10.2002 and 07.01.2004, the ion production rate in the middle and upper atmosphere is estimated using the CRAC:EPII model
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