The Study of Main Ionospheric Trough from Multi-station Observations
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摘要: 本文利用位于不变纬度∧=46°—70°S之间的四个电离层站的观测数据,分析了电离层主糟的基本特性.分析结果表明,电离层主槽有如下特征:(1)槽在冬季夜间出现较为明显,春秋季夜间较弱,夏季夜间和所有季节的白天均观测不到;(2)槽的特点有二,一是其电子密度异常地低,二是层的虚高有较大的增加;(3)槽的极向壁较稳定,且有较陡峭的电子密度梯度,而槽的赤道向壁较多变,电子密度梯度较平缓;(4)槽出现的主要时段是在20:00—03:00(LT),在此期间,槽处于不断的变化和运动之中.Abstract: This paper presents the principal characteristics of main ionospheric trough with analysis of observational data from four ionosonde stations located between invariant latitudes A = 46-70°S. The results show following properties of main ionospheric trough: (1) the trough manifests one-self mostly in winter night; (2) the trough has two features: low electron density and large virtual height, (3) the characteristics of equatorial edge and poleward edge of trough are different; (4) the trough is in unceasing motions and variations during night.
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