Fine structure of substorm and geomagnetically induced currents
Fine structure of substorm and geomagnetically induced currents
复制标题
亚暴和地磁感应电流的精细结构
DOI：
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复制
发表时间：
2019
期刊：
影响因子：
--
通讯作者：
M. Dobrovolsky
中科院分区：
文献类型：
--
作者：
O. Kozyreva;V. Pilipenko;R. Krasnoperov;L. Baddeley;Y. Sakharov;M. Dobrovolsky
由于亚暴引起的地球磁场dB/dt的快速变化可以激发大的地磁感应电流（gic），这可能对技术系统产生有害影响。本文利用沿地磁经度110°的IMAGE磁强计链数据，对Fennoscandia观测到的dB/dt增强特征进行了分析。地磁场的突变可能与亚暴的发生、孤立磁脉冲事件（MIEs）以及被称为Ps6脉动的准周期序列（周期为5-15分钟）有关。为了详细研究dB/dt增强的纬向结构及其与极光椭圆边界的关系，我们应用了磁纵图技术。这种简单的技术有助于可视化和表征亚暴的精细结构，即dB/dt增强在时间和纬度上的位置。用OVATION-prime模型估计了极光椭圆边界的位置。在所研究的不同类型的脉冲扰动中，极光亚暴的发生提供了最大的GICs（几十A）。孤立的夜侧密电也能有效地激发GICs （bbb10a）。Ps6脉冲在20 A左右甚至更高量级的gic激励中是有效的。单色Pc5脉冲能够诱导明显的gic，最高可达~13 A。在短时间尺度上的大的局域扰动是gic的实际驱动因素，它们可以被想象成磁层“雷暴”期间的地磁“冲程”。
The rapid changes dB/dt of the Earth’s magnetic field due to substorms can excite large geomagnetically-induced currents (GICs) that can have harmful effects on technological systems. This paper presents an analysis of the characteristics of dB/dt enhancements observed in Fennoscandia using data from the IMAGE magnetometer chain along a geomagnetic longitude of 110 o . The abrupt geomagnetic field variations may be associated with the substorm onsets, isolated magnetic impulsive events (MIEs), and quasi-periodic series of MIEs, known as Ps6 pulsations (periods 5-15 min). For a detailed examination of the latitudinal structure of dB/dt enhancements and their association with the auroral oval boundaries we applied the technique of magnetic keograms. This simple technique helps to visualize and characterize the fine structure of substorm, namely the location in time and latitude of dB/dt enhancements. The location of the auroral oval boundaries has been estimated with the OVATION-prime model. Among the different types of impulsive disturbances investigated auroral substorm onset provides the largest GICs (few tens of A). Isolated nightside MIEs are also effective in the excitation of GICs (>10 A). Ps6 pulsations are effective in the excitation of GICs with magnitude about 20 A and even higher. Monochromatic Pc5 pulsations are capable to induce noticeable GICs, up to ~13 A. Large localized disturbances on short timescales are the actual drivers of GICs, and they may be imagined like geomagnetic “strokes” during magnetospheric “thunderstorms”.
影响因子：
3.3
作者：
V. Belakhovsky;V. Pilipenko;M. Engebretson;Y. Sakharov;Vasily Selivanov
通讯作者：
V. Belakhovsky;V. Pilipenko;M. Engebretson;Y. Sakharov;Vasily Selivanov
共轭电离层中纬向ULF波功率分布与极光椭圆的对应关系
DOI：
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发表时间：
2018
期刊：
Sun and geosphere
影响因子：
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作者：
Martines-Bedenko, V.A.
通讯作者：
Martines-Bedenko, V.A.