THE INFLUENCE OF IONOSPHERIC ION ABUNDANCES ON THE LONGITUDINAL EFFECT OF WHISTLER PROPAGATION AT LOW LATITUDE
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摘要: Iss-b卫星探测结果表明,|电离层离子丰度呈现经度变化.本文选取较真实的电离层模型参数,对130°E和114°E两个子午面内传播的低纬哨声进行了射线跟踪.我们发现,由于[O+],[He+]和[H+]决定的电子浓度垂直梯度的经度变化,导致哨声传播特性的经度效应,使得130°E比114°E内传播的低纬哨声更好地满足透射条件:|μsinδ|≤1.与电子浓度的水平梯度的影响比较,离子丰度决定的电子浓度垂直梯度随经度的变化使哨声传播产生的经度效应明显得多.武昌(地理30.5°N,114.6°E;地磁19.3°N).和鹿儿岛(31.5°N,130.8°E;20.5°N)两台站观测到的哨声出现率的经度效应证实了本文的理论预言.Abstract: The observation results of Iss-b satellite show that ionospheric ion abundances vary with longitudes. The most realistic ionospheric electron density models are selected to trace whistler rays of low latitudes in 130°Eand 114°Emeridian planes. The computational results show that the longitudinal variations of vertical gradients of electron density controlled by [O+] , [He+] and [H+] result in the longitudinal effect of whistler propagation. Low latitude whistlers in 130°Esatisfy the penetrating condition |μsinδ |≤1 better than that in 114°E. It is found that the influence of longitudinal variation of vertical gradients of electron density controlled by ion abundances is greater than that of horizontal gradients of electron density controlled by equatorial anomaly. The observed whistler occurrence rates at Wuchang (30.5°N Geog., 114.6°E; 19.3°N Geom) and Kagoshima (31.5°N, 130.8°E; 20.5°N) are in good agreement with the theoretical predictions in this paper.
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Key words:
- Whistler propagation /
- Ion abundance /
- Longitudinal effect
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