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Magnetotail current contribution to the Dst Index Using the MT Index and the WINDMI model

机译：使用MT指数和WINDMI模型的磁尾电流对Dst指数的贡献

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摘要

In this paper, we have improved the capabilities of a low dimensional nonlinear dynamical model called WINDMI to determine the state of the global magnetosphere by employing the magnetotail (MT) index as a measurement constraint during large geomagnetic storms. The MT index is derived from particle precipitation measurements made by the NOAA/POES satellites. This index indicates the location of the nightside ion isotropic boundary, which is then used as a proxy for the strength of the magnetotail current in the magnetosphere. In Asikainen et al. (2010), the contribution of the tail current to the Dst index is estimated from an empirical relationship based on the MT index. Here the WINDMI model is used as a substitute to arrive at the tail current and ring current contribution to the Dst index, for comparison purposes. We run the WINDMI model on 7 large geomagnetic storms, while optimizing the model state variables against the Dst index, the MT index, and the AL index simultaneously. Our results show that the contribution from the geotail current produced by the WINDMI model and the MT index are strongly correlated, except during some periods when storm time sub-storms are observed. The inclusion of the MT index as an optimization constraint in turn increases our confidence that the ring current contribution to the Dst index calculated by the WINDMI model is correct during large geomagnetic storms.
机译：在本文中，我们通过使用磁尾（MT）指数作为大地磁风暴期间的测量约束条件，改进了称为WINDMI的低维非线性动力学模型确定全球磁层状态的能力。 MT指数来自NOAA / POES卫星进行的颗粒降水测量。该指数指示夜间离子各向同性边界的位置，然后将该位置用作磁层中磁尾电流强度的替代。在Asikainen等人中。 （2010年），尾电流对Dst指数的贡献是根据基于MT指数的经验关系估算的。在这里，WINDMI模型用作替代，以得出尾电流和振铃电流对Dst指数的贡献，以进行比较。我们在7个大型地磁风暴中运行WINDMI模型，同时针对Dst指数，MT指数和AL指数优化模型状态变量。我们的结果表明，由WINDMI模型产生的地尾流和MT指数的贡献是高度相关的，除了在观察到暴风雨时间的部分暴风雨期间。将MT指数作为优化约束包括在内，反过来增加了我们的信心，即在大地磁风暴期间，由WINDMI模型计算出的环流对Dst指数的贡献是正确的。

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  • 来源
    《Advances in space research》 |2013年第11期|1974-1986|共13页
  • 作者

    E. Spencer; S. Patra; T. Asikainen;

  • 作者单位

    Centrefor Space Engineering, Utah State University, 4120 Old Main Hill, Logan, UT 84322-4120, USA;

    Centrefor Space Engineering, Utah State University, 4120 Old Main Hill, Logan, UT 84322-4120, USA;

    Department of Physics, Centre of Excellence in Research, PO Box 3000, FIN-90014, University of Oulu, Finland;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    Dst index; Isotropic boundary; Magnetotail current; MT-index;

    机译：Dst索引;各向同性边界磁尾电流;MT指数;

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