We calculate high latitude electrodynamic parameters using global maps of field‐aligned currents from the Active Magnetosphere and Planetary Response Experiment (AMPERE). The model is based on previous studies that relate field‐aligned currents to auroral Pedersen and Hall conductances measured by incoherent scatter radar. The field‐aligned currents and conductances are used to solve for the electric potential at high latitudes from which electric fields are computed. The electric fields are then used with the conductances to calculate horizontal ionospheric currents. We validate the results by simulating the SuperMAG magnetic indices for 30 geomagnetically active days. The correlation coefficients between derived and actual magnetic indices were 0.68, 0.76, and 0.84 for the SMU, SML, and SME indices, respectively. We show examples of times when the simulations differ markedly from the measured indices and attribute them to either small‐scale, substorm‐related current structures or the effects of neutral winds. Overall, the performance of the model demonstrates that with few exceptions, auroral electrodynamic parameters can be accurately deduced from the global field‐aligned current distribution provided by AMPERE.

中文翻译：

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从AMPERE磁场对准电流测量确定极光电动力学参数

我们使用来自主动磁层和行星响应实验（AMPERE）的场对准电流的全局图来计算高纬度电动参数。该模型基于先前的研究，这些研究将场对准电流与通过非相干散射雷达测量的极光Pedersen和霍尔电导联系起来。场对准的电流和电导用于求解高纬度的电势，并据此计算电场。然后将电场与电导一起使用，以计算水平电离层电流。我们通过模拟30个地磁活跃天的SuperMAG磁指数来验证结果。对于SMU，SML和SME指数，导出的和实际的磁指数之间的相关系数分别为0.68、0.76和0.84。我们提供了一些示例，这些示例中的模拟与实测指标明显不同，并将它们归因于小规模，与亚暴雨有关的当前结构或中性风的影响。总体而言，该模型的性能表明，除极少数情况外，可以从AMPERE提供的全局场对准电流分布中准确推导出极光电动力学参数。