The statistical analysis of the Geomagnetically Induced Current events occurred in Guangdong, China during the declining phase of solar cycle 23 (2003_2006)

[摘要] We study the interplanetary causes of intense geomagnetic storms (Dst ≤ -100 nT) and the corresponding Geomagnetically Induced Current (GIC) events occurred in Ling'ao nuclear power station, Guangdong during the declining phase of solar cycle 23 (2003-2006). The result shows that sMC (a magnetic cloud with a shock), SH (sheath) and SH+MC (a sheath followed by a magnetic cloud) are the three most common interplanetary structures responsible for the storms which will cause GIC events in this period. As an interplanetary structure, CIR (corotating interaction regions) also plays an important role, however, the CIR-driven storms have a relatively minor effect to the GIC. Among the interplanetary parameters, the solar wind velocity and the southward component of the IMF (interplanetary magnetic field) are more important than solar wind density and the temperature to a geomagnetic storm and GIC.

[发布机构] School of Mathematics and Physics, North China Electric Power University, 2 Beinong Road Changping Dist., Beijing; 102206, China^1

[效力级别] 无线电电子学

[关键词] Corotating interaction regions;Geomagnetic storm;Geomagnetically induced currents;Intense geomagnetic storms;Interplanetary magnetic fields;Magnetic clouds;Solar wind density;Solar wind velocity