云南地区地电暴变化分析研究

Analysis and Research on Geoelectric Storm Variation in Yunnan Region

针对2008年以来发生的12次磁情指数K≥6的磁暴事件,分析了云南地区洱源、罗茨台地电场在磁暴发生期间的日变化特征、频谱特征及地电幅度与磁暴指数K及ΣK之间的相关关系,结果表明:地电场所有测向的不同装置均能记录到同步的地电暴变化,其最大变化幅度与相关系数均明显高于正常日变;不同地区的地电场观测对磁暴事件的响应程度不一样,且随着磁情指数K的增大明显增强,并对其物理机制进行了讨论。

Based on 12 geomagnetic storm events with K≥ 6 geomagnetic index since 2008,we analyzed the characteristic of diurnal variation and frequency spectrum,and the relation between the maximum amplitude of geoelectric storm and the geomagnetic index K and ∑K of the observation data in geoelectric field at Eryuan and Luoci stations in Yunnan region.The result shows that the synchronized geomagnetic storm variation could be recorded by the different devices in all direction measure of the geoelectric field,and the maximum variation amplitude and the correlation coefficient of geomagnetic storm were significantly higher than normal diurnal variation.The response degree of geoelectric field observation in different area to the geomagnetic storm was different,and variation amplitude of geoelectric field obviously increased with the increase of magnetic index K,and the physical mechanism of it was discussed.