利用SuperMAG地基磁强计资料建立亚暴有向网络
Directed Network of Substorms Using SuperMAG Ground-Based Magnetometer Data
摘要：
利用SuperMAG 100+磁强计对亚暴电离层电流系统的时空演化进行了定量研究，并首次利用这些数据构造了动力学有向网络。如果在两个磁力计站观测到的矢量磁场扰动之间的典型互相关超过阈值，则它们形成网络连接。典型互相关最大时的时滞决定了网络连接所捕获的结构的传播或扩展方向。如果空间相关性反映了电离层电流的模式，网络属性可以测试不同的模型的演变亚暴电流system.We选择了86个孤立的亚暴夜侧地面站覆盖的基础上。我们发现，并获得的时间，一个一致的图片中，经典的亚暴电流楔的形式。在亚暴流楔向西扩展后，在午夜前可以看到一个流系统。后期，东扩信号减弱。最后，有证据表明亚风暴增强对流。
英文摘要：
We quantify the spatiotemporal evolution of the substorm ionospheric current system utilizing the SuperMAG 100+ magnetometers.We construct dynamical directed networks from this data for the first time. If the canonical cross-correlation between vector magnetic field perturbations observed at two magnetometer stations exceeds a threshold, they form a network connection. The time lag at which canonical cross-correlation is maximal determines the direction of propagation or expansion of the structure captured by the network connection. If spatial correlation reflects ionospheric current patterns, network properties can test different models for the evolving substorm current system.We select 86 isolated substorms based on nightside ground station coverage. We find, and obtain the timings for, a consistent picture in which the classic substorm current wedge forms. A current system is seen premidnight following the substorm current wedge westward expansion. Later, there is a weaker signal of eastward expansion. Finally, there is evidence of substorm-enhanced convection.
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