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北美与东亚中纬地区电离层TEC变化的EOF建模和分析

DOI: 10.11728/cjss2015.05.556, PP. 556-565

Keywords: 电离层TEC,经验正交函数(EOF),半年/年变化,TEC东西不对称

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Abstract:

考察了北美(30°N-50°N,140°W-50°W)与东亚(42.5°N-57.5°N,65°E-140°E)中纬地区电离层总电子含量(TEC)的变化.TEC数据来自美国喷气动力实验室(JPL)约15年的全球电离层图(GlobalIonosphericMap,GIM)数据.利用经验正交函数(EmpiricalOrthogonalFunctions,EOF)得到上述两地区前三阶本征模及相关时间系数,分别约占TEC总变化的99.57%和99.79%.结果表明,两地区前三阶EOF分量所表现出的TEC变化基本一致.第一阶EOF分量表现为受太阳活动调制的半年变化;第二阶EOF分量表现为关于零磁偏线的经向电子浓度东西不对称结构,计算表明该结构与受地磁偏角控制的热层纬向水平风引起的等离子体向上漂移密切相关;第三阶EOF分量表现为磁倾控制的热层子午向风引起的等离子体向上漂移影响.

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