GIC drivers - the Characteristics of Storm-time Rapid Geomagnetic Variations
GIC drivers - the Characteristics of Storm-time Rapid Geomagnetic Variations
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GIC 驱动因素 - 风暴期地磁快速变化的特征
DOI：
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发表时间：
2020
期刊：
影响因子：
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通讯作者：
M. Hamrin
中科院分区：
文献类型：
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作者：
H. Opgenoorth;A. Schilling;M. Hamrin
通常在亚极光纬度发生的风暴时的快速地磁扰动已被认为是最有害的空间气象现象之一，有可能导致关键电力基础设施的损坏和中断。我们可以表明，亚极光磁尖峰风暴（1000 nT/min的顺序）的外观和时空行为相似的小，但强烈和非常短暂的亚暴，包括三维电流楔和电射流增强形成。从统计学上看，这些尖峰确实发生在所有当地时间，但最好是在午夜前和上午0600 MLT左右，这只是部分符合亚暴类比，并表明可能确实有几种机制在工作。我们将介绍事件和统计研究的结果，以澄清这些潜在的最具破坏性的地磁扰动在SWx领域的物理特性和潜在的驱动程序。
Rapid storm-time geomagnetic disturbances, typically at sub-auroral latitudes, have been recognized as one of the most detrimental space weather phenomena, potentially leading to damage to and outage of critical power infrastructure. We can show that sub-auroral magnetic spikes in storms (of the order of 1000 nT/min) do resemble in their appearance and spatiotemporal behavior small but intense and very short-lived substorms, including three-dimensional current wedge and electrojet-enhancement formation. Statistically these spikes do occur at all local times, but preferably pre-midnight and around 0600 MLT in the morning sector, which is only partially in agreement with the substorm analogy, and indicate that there may indeed be several mechanisms at work. We will present results from event and statistical studies to clarify the physical characteristics and potential drivers for these potentially most damaging geomagnetic disturbances in the SWx realm.