太阳物理研究组知识库

太阳活动会引起输变电系统异常,特别是对超长距离输变电系统的危害尤其明显.根据SOHO/LASCO(Solar and Heliospheric Observatory/Large Angle and Spectrometric Coronagraph)的日冕物质抛射(Coronal Mass Ejection,CME)数据、华北电力大学和芬兰气象研究所获得的地磁感应电流(Geomagnetically Induced Current,GIC)数据以及地磁暴数据,分析研究了与GIC事件有关的对地晕状CME的重要观测特征和物理性质.按照对称性将晕状CME进行分类后,发现造成GIC事件的晕状CME主要有3类:完全对称型、亮度不对称型和外形不对称型.不同类型的全晕状CME驱动的GIC事件在强度、持续时间等方面特征各不相同.其中,亮度不对称型晕状CME很有可能对GIC事件影响最为严重.同时注意到GIC与地磁场随时间的变化率也具有较好的相关性.

Solar activities and eruptions can cause the power transmission system to be an abnormal condition, especially for an extra-long distance electric power transmission system. We analyzed the coronal mass ejection (CME) data from SOHO/LASCO (Solar and Heliospheric Observatory~Large Angle and Spectrometric Coronagraph), and the geo- magnetically induced current data and the geomagnetic storm data from North China Electric Power University and Finnish Meteorological Institute, respectively. After classifying the observed halo CMEs into three types according to their symmetry: complete symmetric, brightness asymmetric, and outline asymmetric. The geomagnetically induced current events that are driven by three different types of halo CMEs have different characteristics in intensity, duration and period. We found that the brightness asymmetric halo CMEs are most likely to cause the major damage to the transmission system. The geomagnetically induced current also has a good correlation to the time variation of the geomagnetic field.