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根据Cluster卫星2001年9月30日在北半球极尖区观测到的一次强扰动场向电子事件数据,分析研究了这次事件期间场向电子的能量特性,讨论了场向电子对太阳风能量向磁层的传输和磁层-电离层耦合过程中能量传输的作用.分析认为,这次电子扰动事件期间电子速度和密度都具有很强的扰动变化,电子速度增加是一个主要特点.本次事件中低能段5~200 eV和500~1500 eV内的能谱分析结果表明,上行电子通量大于下行电子通量,上行电子主要来源于电离层,说明电离层上行电子在本次事件中具有非常活跃的作用.根据电离层中带电粒子的能量特征分析结果可知,这次事件中电离层起源的上行电子在上行过程中得到了加速.关于加速机制问题还有待深入研究.
Based on the data of a strong perturbation field observed by Cluster Satellite in the polar region of the northern hemisphere on September 30, 2001, the energy characteristics of the field-oriented electrons during the event were analyzed and discussed. The effects of field-oriented electrons on solar wind energy Layer transport and the role of energy transfer in the magnetosphere-ionosphere coupling process.The analysis shows that the electron velocity and density have a strong perturbation change during the electron perturbation event, and the increase of the electron velocity is a major feature.In this incident The results of energy spectrum analysis in the low energy range of 5 ~ 200 eV and 500 ~ 1500 eV show that the up-going electron flux is larger than the down-going electron flux, and the up-going electrons mainly come from the ionosphere, indicating that the ionospheric up-going electrons are very active in this event According to the analysis of the energy characteristics of the charged particles in the ionosphere, it can be seen that the upward electrons of the ionospheric origin in this event have been accelerated in the upward course, and the acceleration mechanism remains to be further studied.