首页> 美国政府科技报告 >A Simplified Theory of ELF Propagation in the Earth-Ionosphere Transmission Line and Its Worldwide Application
【24h】

A Simplified Theory of ELF Propagation in the Earth-Ionosphere Transmission Line and Its Worldwide Application

机译:地球 - 电离层输电线路中ELF传播的简化理论及其在世界范围内的应用

获取原文

摘要

An approximate theory of ELF propagation in the Earth-ionosphere transmission line is developed by combining the reflection theory of Booker and Lefeuvre (1977) with Greifinger and Greifinger's treatment 81978, 1979) of the effect of ionization below the level of reflection. The theory allows for the influence of the Earth's magnetic field, for reflection from the gradient on the under side of the D region (or, at night, of a ledge below the E region), for reflection from the gradient on the under side of the E region, and for reflection from the gradient on the top side of the E region. The procedure is to compare local vertical gradient with local wavelength, thereby classifying altitude into intervals where the gradient is high and ones where it is low. Where the gradient is low, the phase-integral treatment is adequate. An interval where the gradient is high may, to a first approximation, be replaced by a discontinuity. The amount of the discontinuity is the difference between the refractive indices at the top and bottom of the interval of high gradient, judged in relation to local wavelength. It is then a matter of combining reflections from the several discontinuities. This requires calculation of the complex phase-changes between the discontinuities. But these are the intervals where the phase-integral treatment is available. To a better approximation, there is a non-zero phase-change associated with an interval of high gradient. The method for incorporating this is described.

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱:kefu@zhangqiaokeyan.com

京公网安备:11010802029741号 ICP备案号:京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有
  • 客服微信

  • 服务号