Directed Network of Substorms Using SuperMAG Ground‐Based Magnetometer Data
Directed Network of Substorms Using SuperMAG Ground‐Based Magnetometer Data
复制标题
使用 SuperMAG 地面磁力计数据的定向亚暴网络
DOI：
10.1029/2019gl082824
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发表时间：
2019
影响因子：
5.2
通讯作者：
J. Gjerloev
中科院分区：
文献类型：
--
作者：
L. Orr;S. Chapman;J. Gjerloev;J. Gjerloev
我们利用SuperMAG 100+磁强计对亚暴电离层电流系统的时空演化进行了量化。我们首次利用这些数据构建了动态有向网络。如果在两个磁力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。典型互相关最大的时间延迟确定由网络连接捕获的结构的传播或扩展的方向。如果空间相关性反映了电离层电流模式，网络特性可以测试演变中的亚暴电流系统的不同模型。我们根据夜间地面站的覆盖率选择了86个孤立的亚暴。我们发现并获得了经典亚暴气流楔形形成的一致图景。在亚暴洋流楔形向西扩展之后，在午夜前可以看到一个洋流系统。后来，出现了一个较弱的向东扩张的信号。最后，还有亚风暴增强对流的证据。
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.
影响因子：
4.6
作者：
Malik, Nishant;Bookhagen, Bodo;Kurths, Juergen
通讯作者：
Kurths, Juergen