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对地全晕状CME诱发的地磁感应电流统计研究
Alternative TitleThe geomagnetically induced current events driven by halo coronal mass ejections
王开让
Subtype硕士
Thesis Advisor林隽
2011-06-01
Degree Grantor中国科学院研究生院(云南天文台)
Place of Conferral北京
Degree Discipline天体物理
Keyword日冕物质抛射 地磁感应电流 地磁暴
Abstract日冕物质抛射即(CME)作为太阳大气中的一种剧烈的爆发,会对我们的生活产生巨大的影响。由CME引驱动的地磁感应电流事件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。我们根据SOHO/LASCO的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数据以及地磁暴数据,分析研究了与地磁感应电流事件有关的对地全晕状CME的重要观测特征和物理性质。 本文分为以下几部分: 第一章,引言,介绍日冕物质抛射,地磁感应电流,地磁暴,太阳活动预报和常用于信号分析的小波变换技术。 第二章,分析了根据数据收集到的有关数据,GIC事件与晕状CME、地磁暴地磁场变化之间的关系。按照对称性我们将晕状CME进行分类后,发现造成地磁感应电流事件的晕状CME主要有三类:完全对称型、亮度不对称型、和外形不对称型。三种不同类型的全晕状CME驱动的地磁感应电流事件在强度、持续时间等特征各不相同。其中,亮度不对称型晕状CME很有可能对地磁感应电流事件影响最为严重。我们同时注意到GIC与地磁场随时间的变化率也具有较好的相关性。 第三章,结论与展望。
Other AbstractCoronal mass ejections ( CMEs ) are vast eruptions exploded from the solar atmosphere, which can affect the life of our human being. The geomagnetically induced current which is driven by coronal mass ejection can damage the power transmission system, especially for an extra-long distance electric power transmission system. We have analyzed the coronal mass ejection (CME) data from SOHO / LASCO, the geomagnetically induced current data and the geomagnetic storm data, which are from the North China Electric Power University and the Finnish Meteorological Institute.We have studied the characteristics and physical properties of all halo coronal mass ejection, which are related to geomagnetically induced currents. This thesis is structured as follow: In chapter one, coronal mass ejections, geomagnetically induced currents, magnetic storm, prediction method for solar activity and wavelet transform are introduced. In chapter two, the relationship between geomagnetically induced currents and coronal mass ejections, magnetic storm, geomagnetic field variation have been analyzed. According to their symmetry, the observed halo CMEs are classified into three types: complete symmetry, brightness asymmetry, and outline asymmetry We found that the brightness asymmetric halo CMEs have the maximum possibilities 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 dB/dt. The geomagnetically induced current events that are driven by three different types of halo coronal mass ejection have different characteristics in intensity, duration and period. In chapter three, the conclusion and prospect are presented.
Subject Area天文学
Pages54
Language中文
Document Type学位论文
Identifierhttp://ir.ynao.ac.cn/handle/114a53/6613
Collection太阳物理研究组
Recommended Citation
GB/T 7714
王开让. 对地全晕状CME诱发的地磁感应电流统计研究[D]. 北京. 中国科学院研究生院(云南天文台),2011.
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