First results are presented of the modeling of magnetospheric storm events, based on: (i) a new method to represent the magnetic field by means of the so‐called cylindrical basis functions, (ii) the data mining approach by Sitnov et al. (2008); https://doi.org/10.1029/2007ja013003, and (iii) upgraded and extended pool of multi‐mission data taken in 1995–2019. The study is focused on the low‐latitude magnetospheric domain in the distance range 3–18R_E bounded by field line shells with footpoint latitudes ±70°. The magnetic configurations are reconstructed from data subsets, selected from the grand database by the nearest‐neighbor method, using both interplanetary data and the ground disturbance indices. A strong storm of May 27–29, 2017, has been studied in relation to its effect on the reconfiguration of the low‐latitude magnetosphere. The modeling reproduces the main features of the magnetosphere dynamics in terms of the geomagnetic field depression/compression and extremely variable field line stretching. The initial contraction of the magnetosphere during the storm sudden commencement results in a local transient surge of the inner tail current and a dramatic antisunward discharge of the magnetic flux. As the storm progresses, the ring current buildup results in a strongly depressed magnetic field in the inner magnetosphere, which expels the magnetic flux to larger distances and increases the field line connection across the more distant tail plasma sheet. At the same time, a strong dawn‐dusk asymmetry is developed due to the formation of the duskside partial ring current, in agreement with previous independent results.

中文翻译：

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利用圆柱基函数和多任务数据挖掘重建磁层风暴时间动力学

给出了对磁层风暴事件建模的初步结果，该模型基于：（i）一种通过所谓的圆柱基函数表示磁场的新方法，（ii）Sitnov等人的数据挖掘方法。（2008）；https://doi.org/10.1029/2007ja013003，以及（iii）升级和扩展了1995-2019年获得的多任务数据集。该研究集中在距离范围3–18 R _E的低纬磁层范围以点线纬度为±70°的场线壳为边界。利用星际数据和地面干扰指数，从数据子集重建磁配置，这些数据子集是通过最近邻法从大型数据库中选择的。已经研究了2017年5月27日至29日的强风暴，它对低纬度磁层的重新构造产生了影响。该模型再现了磁层动力学的主要特征，即地磁场的压降/压缩和极可变的磁力线伸展。在暴风雨突然开始期间，磁层的初始收缩会导致内部尾电流的局部瞬态浪涌和磁通量急剧的逆阳放电。随着风暴的进行，环形电流的积累会导致内部磁层中的磁场强烈减弱，从而将磁通量推至更大的距离，并增加更远的尾部等离子体片上的磁力线连接。同时，由于黄昏的部分环流的形成，形成了强烈的黎明-黄昏不对称性，这与以前的独立结果一致。