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DOI | 10.1029/2021GL094076 |
Characterization of Transient-Large-Amplitude Geomagnetic Perturbation Events | |
Brett A. McCuen; Mark B. Moldwin; Mark Engebretson | |
2021-07-15 | |
发表期刊 | Geophysical Research Letters |
出版年 | 2021 |
英文摘要 | We present a characterization of transient-large-amplitude (TLA) geomagnetic disturbances that are relevant to geomagnetically induced currents (GIC). TLA events are defined as one or more short-timescale ( < 60 seconds) dB/dt signature with magnitude ≥ 6 nT/s. The TLA events occurred at six stations of the Magnetometer Array for Cusp and Cleft Studies throughout 2015. A semi-automated dB/dt search algorithm was developed to identify 38 TLA events in the ground magnetometer data. While TLA dB/dts do not drive GICs directly, we show that second-timescale dB/dts often occur in relation to or within larger impulsive geomagnetic disturbances. Sudden commencements are not the main driver, rather the events are more likely to occur 30 minutes after a substorm onset or within a nighttime magnetic perturbation event. The characteristics of TLA events suggest localized ionospheric source currents that may play a key role in generating some extreme geomagnetic impulses that can lead to GICs. |
领域 | 气候变化 |
URL | 查看原文 |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/333970 |
专题 | 气候变化 |
推荐引用方式 GB/T 7714 | Brett A. McCuen,Mark B. Moldwin,Mark Engebretson. Characterization of Transient-Large-Amplitude Geomagnetic Perturbation Events[J]. Geophysical Research Letters,2021. |
APA | Brett A. McCuen,Mark B. Moldwin,&Mark Engebretson.(2021).Characterization of Transient-Large-Amplitude Geomagnetic Perturbation Events.Geophysical Research Letters. |
MLA | Brett A. McCuen,et al."Characterization of Transient-Large-Amplitude Geomagnetic Perturbation Events".Geophysical Research Letters (2021). |
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