根据地磁指数对突发脉冲的响应推断震后太阳风的特性
Properties of post-shock solar wind deduced from geomagnetic indices responses after sudden impulses
摘要：
行星际激波是导致地球空间环境发生全球性动态变化的关键因素。从日地关系的角度出发，简单而准确地估计激波后太阳风的性质具有重要意义。出于这一动机，我们进行了统计分析的IP冲击在1998-2008年，重点是显着不同的反应，两个常用的地磁指数（SYMH和AL）的被动的两种类型的IP冲击。对于IMF北向的IP冲击（91例），SYMH指数在突发脉冲（SI）后的较长时间内保持在较高水平。而AL指数的变化相对较小，平均值仅为-29nT。而对于IMF向南的IP冲击（92例），SI后SYMH指数以一定速率突然下降，AL指数变化更为显著，为-316nT。此外，发现SI后SYMH指数的变化率与电击后重连电场（E $_{KL}$）呈线性相关。在此基础上，建立了震后IMF方向和E $_{KL}$的反演模型。通过对2009-2013年68次IP冲击的研究，验证了模型的有效性。IMF方位的反演精度为88.24%，E $_{KL}$的反演效率高达78%。
英文摘要：
Interplanetary (IP) shock plays a key role in causing the global dynamic changes of the geospace environment. For the perspective of Solar-Terrestrial relationship, it will be of great importance to estimate the properties of post-shock solar wind simply and accurately. Motivated by this, we performed a statistical analysis of IP shocks during 1998-2008, focusing on the significantly different responses of two well-used geomagnetic indices (SYMH and AL) to the passive of two types of IP shocks. For the IP shocks with northward IMF (91 cases), the SYMH index keeps on the high level after the sudden impulses (SI) for a long time. Meanwhile, the change of AL index is relative small, with an mean value of only -29 nT. However, for the IP shocks with southward IMF (92 cases), the SYMH index suddenly decreases at a certain rate after SI, and the change of AL index is much significant, of -316 nT. Furthermore, the change rate of SYMH index after SI is found to be linearly correlated with the post-shock reconnection E-field (E$_{KL}$). Based on these facts, an inversion model of post-shock IMF orientation and E$_{KL}$ is developed. The model validity is also confirmed by studying 68 IP shocks in the period of 2009-2013. The inversion accuracy of IMF orientation is 88.24%, and the inversion efficiency of E$_{KL}$ is as high as 78%.
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