Derivation of electron-density profiles in the lower ionosphere using radio absorption measurements at multiple frequencies
Derivation of electron-density profiles in the lower ionosphere using radio absorption measurements at multiple frequencies
复制标题
使用多个频率下的无线电吸收测量推导低电离层中的电子密度分布
DOI：
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发表时间：
1963
期刊：
影响因子：
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通讯作者：
C. Little
中科院分区：
文献类型：
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作者：
R. Parthasarathy;G. Lerfald;C. Little
已开发出一种新方法，可在电离层扰动条件下推导出最低电离层的电子密度分布图。在同时测量电离层在几个频率上的吸收的基础上，以及电子碰撞频率随高度变化的假设模型，磁离子理论的Sen-Wyller公式被用来计算最能产生观测吸收值的剖面。该方法进行了描述，并讨论了它的一些局限性。它的使用说明了通过代表性的电子密度分布的极帽1961年7月的吸收事件。这些剖面图表明，该层底部的高度从30公里到50公里不等，频率为30兆周/秒的最大吸收区系统地出现在约60公里处。
A new method has been developed permitting the derivation, during disturbed ionospheric conditions, of the electron-density profiles in the lowermost ionosphere. On the basis of simultaneous measurement of ionospheric absorption on several frequencies, and an assumed model of the variation of electron collision frequency with height, the Sen-Wyller formulation of the magnetoionic theory is used to compute the profile best capable of producing the observed absorption values. The method is described, and some of its limitations are discussed. Its use is illustrated by means of representative electron-density profiles derived for the polar-cap absorption events of July 1961. These profiles show that the base of the layer varied in height from 30 to 50 km, and that the region of maximum absorption, for a frequency of 30 Mc/s, occurred systematically at about 60 km.