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首页> 外文期刊>Journal of Geophysical Research, A. Space Physics: JGR >Parametric analysis of nightside conductance effects on inner magnetospheric dynamics for the 17 April 2002 storm
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Parametric analysis of nightside conductance effects on inner magnetospheric dynamics for the 17 April 2002 storm

机译：阴面电导参数分析对内部的磁性层的动力学的影响2002年4月17日风暴

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摘要

Numerous simulations were conducted in order to quantify the influence of nightside conductance morphology and intensity on the storm-time ring current and plasmasphere. The study focused on the moderate magnetic storm of 17 April 2002. The simulation results were compared against measurements of the ring current and plasmasphere in order to assess the accuracy as a function of conductance parameter setting. In particular, three data sets were used: Dst*, plasmapause location as extracted from IMAGE EUV snapshots, and IMAGE HENA flux observations for the 39–60 keV energy range. While no single simulation conducted for this study proved itself to be the best overall match to the selected data sets, many things were learned from the simulations. The most important scientific finding is that there is an optimal conductance level for maximal ring current intensity. Too little conductance leads to large shielding potentials that effectively inhibit ring current growth, while too much conductance leads to continual flow-through of the hot ions with no significant hot ion accumulation in the inner magnetosphere. It was found that the poleward shift of the high conductance region of the auroral oval was the most important factor affecting the data-model comparisons. The peak intensity of the auroral oval conductance was also determined to be a significant factor affecting model accuracy. Tilting the dawnside location of the oval equatorward with respect to its duskside latitude had little effect on the results, as did the setting for the uniformly applied baseline conductance. The high-latitude boundary condition for the potential solution was also found to have little influence on the results.
机译：大量的模拟来进行量化阴面电导的影响storm-time环形态和强度当前和等离子体层。2002年4月17日的温和的磁暴。对仿真结果进行了比较测量环电流和等离子体层为了评估精度的函数电导参数设置。三种数据集:Dst *,等离子体层顶位置从图像中提取EUV快照,和图像希39-60通量观测keV能量范围。进行这项研究证明了自己的最好的整体匹配所选择的数据集,很多事情从模拟。最重要的科学发现有一个最优最大电导水平环电流强度。导致大屏蔽势有效地抑制环电流增长,太多的电导导致持续的材料的热离子没有意义热离子积累的内部磁气圈。这是发现向极高的转变电导地区极光椭圆的影响数据模型的最重要的因素比较。椭圆形电导也确定为重要因素影响模型的准确性。椭圆形的dawnside位置倾斜朝赤道方向对其duskside纬度对结果影响很小,因为做了吗设置统一的基线电导。潜在的解决方案也被发现对结果影响不大。

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