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哨声传播
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  whistler propagation
     THE INFLUENCE OF IONOSPHERIC ION ABUNDANCES ON THE LONGITUDINAL EFFECT OF WHISTLER PROPAGATION AT LOW LATITUDE
     电离层离子丰度对哨声传播经度效应的影响
短句来源
     In this paper,the general characteristics of low-latitude whistler propagation is investigated by analysing the data obtained at Wuchang (geom.lat.19.2°N) for last three years.
     本文利用武昌(磁纬19.2°N)连续三年的哨声观测资料,研究了武昌地区哨声传播的一般特征。
短句来源
  相似匹配句对
     PROPAGATION CHARACTERISTICS OF WINTER WHISTLERS IN NORTHERN CHINA
     中国北方地区冬季哨声传播特征
短句来源
     Whistlers of Low-Latitude
     低纬度哨声
短句来源
     Wave propagation
     波的传播
短句来源
     THE INFLUENCE OF IONOSPHERIC ION ABUNDANCES ON THE LONGITUDINAL EFFECT OF WHISTLER PROPAGATION AT LOW LATITUDE
     电离层离子丰度对哨声传播经度效应的影响
短句来源
     WHISTLERS DISPLAY CIRCUIT
     哨声显示电路
短句来源
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  whistler propagation
Some features of whistler propagation in magnetospheric plasma
      


In this paper,the general characteristics of low-latitude whistler propagation is investigated by analysing the data obtained at Wuchang (geom.lat.19.2°N) for last three years.Attention is paid to the study of whistler propagation paths.Besides,a closed examination is made of the correlation between the whistler parameters at Wuchang and ionospheric electron concentration,as well as the geomagnetic activity.A good correlation has been found between whistler dispersion and f0F2.It is also shown that there exists...

In this paper,the general characteristics of low-latitude whistler propagation is investigated by analysing the data obtained at Wuchang (geom.lat.19.2°N) for last three years.Attention is paid to the study of whistler propagation paths.Besides,a closed examination is made of the correlation between the whistler parameters at Wuchang and ionospheric electron concentration,as well as the geomagnetic activity.A good correlation has been found between whistler dispersion and f0F2.It is also shown that there exists a type of whistler with stationary dispersion values,the occurrence rate of which is much higher than other types.This is one of the remarkable features of whistlers at Wuchang,showing that in the low-latitude ionosphere region there possibly exist stationary and recurrent whistler propagation paths.In addition,analysis of typical events and statistical calculation both show that the occurrence rate of whistlers increases considerably during magnetic storms.The dispersion value slightly increases following the SSC of the storms,the amplitude of the increase being 118-137% of the monthly mean value.

本文利用武昌(磁纬19.2°N)连续三年的哨声观测资料,研究了武昌地区哨声传播的一般特征。着重对武昌哨声的传播路径进行了分析推断,并讨论了它们与地磁活动的相关特性。发现:武昌哨声的显著特征是色散与电离层f_oF_2有明显的正相关关系;其次常出现一类色散值稳定、出现率也很高的哨声。此外,对典型事件的分析及统计分析都表明武昌哨声出现率在地磁扰动时明显增高;哨声色散在磁暴急始后不久即有一个急剧的上升,上升幅度达18%至37%。

In this paper, ray-tracing computations are carried out to study the propagation mechanism of nighttime whistlers simultaneously observed in four ground stations of South China (Wuchang, geomagnetic Lat. 19.4°N; Zhanjiang, 10°N; Yulin, 7°N; Yong-xing Island, 5.5°N). In the computations a field aligned diffusive equilibrium model for electron-ion density distribution in ionosphere has been used, and a suitable negative latitudinal gradient of ionization associated with the equatorial anomaly has also been taken...

In this paper, ray-tracing computations are carried out to study the propagation mechanism of nighttime whistlers simultaneously observed in four ground stations of South China (Wuchang, geomagnetic Lat. 19.4°N; Zhanjiang, 10°N; Yulin, 7°N; Yong-xing Island, 5.5°N). In the computations a field aligned diffusive equilibrium model for electron-ion density distribution in ionosphere has been used, and a suitable negative latitudinal gradient of ionization associated with the equatorial anomaly has also been taken into account. It is found that in the ionospheric region with geomagnetic latitudes below 20° there exist some nonducted propagation channels of whistler mode waves detectable on the ground. The effects of different wave frequencies and different initial wave normals on the path parameters and whistler dispersion have been examined. The results of present paper can satisfactorily explain the propagation characteristics of some whistlers simultaneously observed in the ground station network mentioned above.

本文利用射线跟踪技术研究了电离层赤道异常区内地面哨声非导管传播的可能性。考察了负电离纬向梯度对非导管哨声传播的影响,并检验了哨声射线路径参数和群时延对频率的依赖关系。计算结果证明,夜间在赤道异常区内的电离层中,存在一些地面可检测哨声的非导管传播通道;沿位于通道内的射线路径传播的哨声波,透出电离层后,可同时激发电离层—地面波导的朝极和朝赤道方向传播;在磁纬10°附近,到达共轭电离层底部的射线有明显的“聚焦”效应。本文结果比较满意地解释了近年来在我国南部地区地面台网(磁纬19.4°N至5.5°N)同时观测到的一部分哨声的传播特征。

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°E and 114°E meridian 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°E satisfy the penetrating condition...

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°E and 114°E meridian 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°E satisfy 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.

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.

 
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