CalcDeltaB: An efficient postprocessing tool to calculate ground‐level magnetic perturbations from global magnetosphere simulations
CalcDeltaB: An efficient postprocessing tool to calculate ground‐level magnetic perturbations from global magnetosphere simulations
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CalcDeltaB：一种高效的后处理工具，用于根据全球磁层模拟计算地面磁扰动
DOI：
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发表时间：
2014
期刊：
影响因子：
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通讯作者：
A. Pulkkinen
中科院分区：
文献类型：
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作者：
L. Rastätter;G. Tóth;M. Kuznetsova;A. Pulkkinen
地面磁场变化会在长导体系统（如高压输电系统）上感应电流。额外的电流会干扰这些导体系统的正常运行，因此，非常需要更好地规范和预测场扰动。在本出版物中，我们介绍了CalcDelta B，这是一种有效的后处理工具，可以根据全球磁层-电离层系统的第一原理模型产生的电流系统的快照计算地面上任何位置的磁扰动ΔB。该工具是在社区协调建模中心最近的“dB/dt”建模挑战中开发的，该挑战将磁扰动及其导数与观测结果进行了比较。计算工具与每个磁层模型分开，并确保统一应用ΔB计算方法，并且使用ΔB的验证研究比较模型的性能，而不是每个模型与可能存在的内置ΔB计算工具的组合。使用该工具，可以根据磁层中的电流、磁层和电离层之间的场向电流以及电离层中的霍尔电流和彼得森电流计算地面上的磁扰动。将新的后处理工具的结果与空间气象建模框架模型内的ΔB计算结果进行了比较，结果非常一致。我们发现，1/30 RE的径向分辨率足以表示来自场向电流区域的对ΔB的贡献。
Ground magnetic field variations can induce electric currents on long conductor systems such as high‐voltage power transmission systems. The extra electric currents can interfere with normal operation of these conductor systems; and thus, there is a great need for better specification and prediction of the field perturbations. In this publication we present CalcDeltaB, an efficient postprocessing tool to calculate magnetic perturbations ΔB at any position on the ground from snapshots of the current systems that are being produced by first‐principle models of the global magnetosphere‐ionosphere system. This tool was developed during the recent “dB/dt” modeling challenge at the Community Coordinated Modeling Center that compared magnetic perturbations and their derivative with observational results. The calculation tool is separate from each of the magnetosphere models and ensures that the ΔB computation method is uniformly applied, and that validation studies using ΔB compare the performance of the models rather than the combination of each model and a built‐in ΔB computation tool that may exist. Using the tool, magnetic perturbations on the ground are calculated from currents in the magnetosphere, from field‐aligned currents between magnetosphere and ionosphere, and the Hall and Pedersen currents in the ionosphere. The results of the new postprocessing tool are compared with ΔB calculations within the Space Weather Modeling Framework model and are in excellent agreement. We find that a radial resolution of 1/30RE is fine enough to represent the contribution to ΔB from the region of field‐aligned currents.