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介绍了计算地球等离子体层He+密度分布的动态全球核心等离子体层模式(DGCPM),模拟了等离子体层结构特性和30.4nm辐射特性,与IMAGE卫星观测结果的对比分析表明:(1)等离子体层顶主要位于5.5RE以内,10min收缩或扩张的特征尺度约0.1RE;(2)等离子体层肩产生于行星际磁场南向偏转并从晨侧向正午方向旋转;(3)等离子体层尾在行星际磁场南向偏转时会向昏侧旋转并变窄.模拟得到从月球上观测时等离子体层位于5.5RE以内,对应月基极紫外相机视场角10.7°×10.7°;等离子体层30.4nm辐射强度为0.1～11.4Rayleigh;首次从侧面模拟出了等离子体层肩和尾结构,其空间变化尺度量级为0.1RE.以上计算结果为月基极紫外相机参数设计提供了重要理论依据.
The dynamic global core plasma layer model (DGCPM) for calculating the He + density distribution of the Earth’s plasma layer is introduced, and the structural characteristics of the plasma layer and the radiation characteristic of 30.4 nm are simulated. The comparative analysis with the IMAGE satellite observations shows that: (1) The top of the layer is mainly located within 5.5 RE and the characteristic scale of contraction or expansion within 10 min is about 0.1 RE. (2) The shoulder of the plasma layer is generated by the southward deflection of the interplanetary magnetic field and rotates from morning to midday. (3) It will rotate to the dusk side and narrow when the interplanetary magnetic field is deflected southward.The simulation results show that the plasma layer is located within 5.5 RE when observed from the lunar surface and corresponds to a field angle of 10.7 ° × 10.7 ° of the moon-based EUV camera. The plasma layer 30.4nm radiation intensity is 0.1 ~ 11.4Rayleigh; for the first time from the side to simulate the plasma layer shoulder and tail structure, the scale of spatial variation of 0.1RE. The above results provide an important theoretical basis for the design parameters of the moon base EUV camera .