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欧洲扇区不同纬度电离层暴特征的统计分析

DOI: 10.6038/cjg20150201, PP. 349-361

Keywords: 电离层暴,季节分布,地方时分布,纬度差异,成分扰动带,穿透电场,扰动风场

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Abstract:

本文利用Madrigal数据库的TEC数据对2001—2010年间的156次单主相型磁暴事件,统计分析了欧洲扇区从赤道到极光带共5个纬度区域的电离层暴特征,结果表明:(1)电离层暴有明显的纬度分布特征,正负暴出现次数的比例随纬度的降低呈现明显的增加趋势,但夏季赤道地区趋势相反,正负暴比例比更高纬度的反而降低;(2)与主相相比,恢复相期间大部分纬度地区正暴数量减少,负暴数量增加,但赤道地区恢复相期间正暴数量反而增加;(3)中低纬地区电离层暴随磁暴MPO地方时分布特征明显,正暴所对应的MPO主要分布在白天,而MPO发生在夜间容易引起负暴;(4)电离层负暴主要发生在夜间,中、高纬地区负暴的开始时间存在‘时间禁区’,但不同纬度‘时间禁区’的地方时分布有一定差异,正暴分布则相对分散.

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