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中文摘要：
电离层沿经度方向变化的3波（WN3）和4波（WN4）经度波数谱成分与高层大气中周日东向2波（DE2）和3波（DE3）潮汐模之间密切相关.利用由JPL全球电离层地图（GIM）数据计算出的总电子积分含量（TEC）的纬度积分ITEC,以及TIMED卫星搭载的TIDI仪器观测到的MLT（Mesopause and lower Thermosphere）高度上的大气水平风场,通过傅里叶变换提取出不同的电离层经度变化的波数谱成分和不同的大气潮汐模,比较了WN3和WN4等波数谱成分与DE2,DE3等潮汐模的年变化和年际变化,发现WN3,WN4的变化分别与DE2,DE3中纬向风分量的变化一致,而与其子午风分量没有明显的联系.通过进一步将电离层经度变化波数谱成分WN3和WN4分解为＂潮汐模＂,结果显示＂DE2＂和＂DE3＂各自在WN3和WN4中起主导作用,它们的年变化和年际变化也同DE2,DE3潮汐类似.最后,复相关分析的结果表明电离层WN3中的＂DE2＂与大气DE2潮汐的纬向风分量在北半球有很好的相关性,电离层WN4中的＂DE3＂则与大气DE3潮汐的纬向风分量在整个中低纬地区相关程度很高;与此同时,子午风分量对电离层＂DE2＂,＂DE3＂的贡献很微弱.这些都说明大气DE2,DE3潮汐的纬向风分量是引起电离层WN3,WN4的重要因素.
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