Statistics of geomagnetic storms: Global simulations perspective
Statistics of geomagnetic storms: Global simulations perspective
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DOI：
10.3389/fspas.2022.972150
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发表时间：
2022-09
期刊：
影响因子：
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通讯作者：
T. Pulkkinen;A. Brenner;Q. Al Shidi;G. Tóth
中科院分区：
文献类型：
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作者：
T. Pulkkinen;A. Brenner;Q. Al Shidi;G. Tóth
我们提出了131地磁风暴模拟密歇根大学空间天气建模框架Geospace配置的结果。我们比较的地磁指数来自模拟与观测，并使用2D切割在中午午夜平面比较磁层顶的位置与经验模型。我们确定当前片中心的位置，并期待在等离子体参数推断尾部动力学。我们表明，模拟产生的地磁指数分布类似于观察到的，并且它们与太阳风驱动器的关系与观察到的相似。虽然Dst和极冠电位的幅度接近所观察到的，模拟的AL指数始终被低估。磁层顶位置的分析表明，日下位置与经验模型吻合得很好，但模拟中的尾耀斑比经验模型中的尾耀斑小得多。磁尾电流和环电流与Dst指数密切相关，并揭示了在风暴主相期间，超过8RE的尾电流对Dst指数的强烈贡献。
We present results of 131 geomagnetic storm simulations using the University of Michigan Space Weather Modeling Framework Geospace configuration. We compare the geomagnetic indices derived from the simulation with those observed, and use 2D cuts in the noon-midnight planes to compare the magnetopause locations with empirical models. We identify the location of the current sheet center and look at the plasma parameters to deduce tail dynamics. We show that the simulation produces geomagnetic index distributions similar to those observed, and that their relationship to the solar wind driver is similar to that observed. While the magnitudes of the Dst and polar cap potentials are close to those observed, the simulated AL index is consistently underestimated. Analysis of the magnetopause position reveals that the subsolar position agrees well with an empirical model, but that the tail flaring in the simulation is much smaller than that in the empirical model. The magnetotail and ring currents are closely correlated with the Dst index, and reveal a strong contribution of the tail current beyond 8 R E to the Dst index during the storm main phase.