Power grid disturbances and polar cap index during geomagnetic storms

Journal of Space Weather and Space Climate

Peter Stauning¹ 

[1] Danish Meteorological Institute,Lyngbyvej 100,DK-2100Copenhagen,Denmark

关键词: polar Ionosphere;    substorms;    magnetic fields;    technological systems;    geomagnetically induced currents (GIC);   

Others  :  800666
DOI  :  doi:10.1051/swsc/2013044

 received in 2013-03-13, accepted in 2013-05-22,  发布年份 2013

【 摘 要 】

The strong geomagnetic storm in the evening of 30 October 2003 caused high-voltage power grid disturbances in Sweden that expanded to produce hour-long power line outage in Malmö located in the southern part of the country. This was not a unique situation. The geomagnetic storm on 13 March 1989 caused extensive disruptions of high-voltage power circuits especially in the Province of Quebec, Canada, but also to a lesser degree in Scandinavia. Similar events have occurred earlier, among others, during the great storms of 13–14 July 1982 and 8–9 February 1986. These high-voltage power grid disturbances were related to impulsive magnetic variations accompanying extraordinarily intense substorm events. The events were preceded by lengthy intervals of unusually high values of the Polar Cap (PC) index caused by enhanced transpolar ionospheric convection. The transpolar convection transports magnetic flux from the dayside to nightside which causes equatorward displacements of the region of auroral activity enabling the substorms to hit vital power grids. During the 30 October 2003 event the intense solar proton radiation disabled the ACE satellite observations widely used to provide forecast of magnetic storm events. Hence in this case the alarmingly high PC index could provide useful warning of the storm as a back-up of the missing ACE-based forecast. In further cases, monitoring the PC index level could provide supplementary storm warnings to the benefit of power grid operators.

【 授权许可】

   
© P. Stauning, Published by EDP Sciences 2013

【 图 表 】

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