Risk assessment of the extreme interplanetary shock of 23 July 2012 on low-latitude power networks

	Risk assessment of the extreme interplanetary shock of 23 July 2012 on low-latitude power networks
	Zhang, J. J.; Wang, C.; Sun, T. R.; Liu, Y. D.
刊名	SPACE WEATHER-THE INTERNATIONAL JOURNAL OF RESEARCH AND APPLICATIONS
	2016
卷号	14 期号:3 页码:259-270
关键词	extreme IP shock GIC risk assessment low-latitude power grids
ISSN号	1542-7390
通讯作者	Zhang, JJ (reprint author), Chinese Acad Sci, Natl Space Sci Ctr, State Key Lab Space Weather, Beijing, Peoples R China.
英文摘要	Geomagnetic sudden commencements (SCs), characterized by a rapid enhancement in the rate of change of the geomagnetic field perturbation (dB/dt), are considered to be an important source of large geomagnetically induced currents (GICs) in middle- and low-latitude power grids. In this study, the extreme interplanetary shock of 23 July 2012 is simulated under the assumption that it had hit the Earth with the result indicating the shock-caused SC would be 123nT. Based on statistics, the occurrence frequency of SCs with amplitudes larger than the simulated one is estimated to be approximately 0.2% during the past 147 years on the Earth. During this extreme event, the simulation indicates that dB/dt, which is usually used as a proxy for GICs, at a dayside low-latitude substation would exceed 100nT/min; this is very large for low-latitude regions. We then assess the GIC threat level based on the simulated geomagnetic perturbations by using the method proposed by Marshall et al. (2011). The results indicate that the risk remains at low level for the low-latitude power network on a global perspective. However, the GIC risk may reach moderate or even high levels for some equatorial power networks due to the influence of the equatorial electrojet. Results of this study feature substantial implications for risk management, planning, and design of low-latitude electric power networks.
收录类别	SCI
语种	英语
内容类型	期刊论文
源URL	[http://ir.nssc.ac.cn/handle/122/5422]
专题	国家空间科学中心_空间科学部
推荐引用方式 GB/T 7714	Zhang, J. J.,Wang, C.,Sun, T. R.,et al. Risk assessment of the extreme interplanetary shock of 23 July 2012 on low-latitude power networks[J]. SPACE WEATHER-THE INTERNATIONAL JOURNAL OF RESEARCH AND APPLICATIONS,2016,14(3):259-270.
APA	Zhang, J. J.,Wang, C.,Sun, T. R.,&Liu, Y. D..(2016).Risk assessment of the extreme interplanetary shock of 23 July 2012 on low-latitude power networks.SPACE WEATHER-THE INTERNATIONAL JOURNAL OF RESEARCH AND APPLICATIONS,14(3),259-270.
MLA	Zhang, J. J.,et al."Risk assessment of the extreme interplanetary shock of 23 July 2012 on low-latitude power networks".SPACE WEATHER-THE INTERNATIONAL JOURNAL OF RESEARCH AND APPLICATIONS 14.3(2016):259-270.