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首页> 外文学位 >THEORETICAL INVESTIGATION OF THE COUPLING AND PROPAGATION OF IONOSPHERIC ELF/VLF RADIATION INTO THE EARTH-IONOSPHERE WAVEGUIDE (MODIFICATION, ARECIBO OBSERVATORY, PUERTO RICO).
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THEORETICAL INVESTIGATION OF THE COUPLING AND PROPAGATION OF IONOSPHERIC ELF/VLF RADIATION INTO THE EARTH-IONOSPHERE WAVEGUIDE (MODIFICATION, ARECIBO OBSERVATORY, PUERTO RICO).

机译：电离层ELF / VLF辐射向地球电离层波导的耦合和传播的理论研究（修正，阿雷西博天文台，波多黎各）。

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摘要

This document describes a theoretical investigation of the propagation of extremely low frequency/very low frequency ELF/VLF, 1-5 kHz radiation from a source located in the D and lower E regions (60-85 km) of the ionosphere to a remote receiving site on the surface of the earth. It provides theoretical support for analyzing results of past experiments and planning future experiments to create an ELF/VLF communication system using high frequency, (HF), heating modification of ionospheric currents.; Analysis of the HF antenna array at the Arecibo Observatory determined that there was enough power in the sidelobes to modify the ionosphere, thereby creating an ELF/VLF source array. The ELF/VLF frequency response calculated for the ionospheric source array compared well with experimentally measured data.; The coupling of radiation from ionospheric sources into the earth-ionosphere wave guide and the propagation of the radiation to receiving sites are investigated in detail using a model based on reciprocity. The ionospheric sources are located at the geographic coordinates of the Arecibo Observatory and the High Power Auroral Simulation, (HIPAS) HF heating facilities. General characteristics are determined: signal losses are dominated by propagation loss within the wave guide; the least attenuated signal is shown to be 1 kHz; the end-on orientation of the current element results in the strongest radiation; and signals from the ELF/VLF sources above the HIPAS facility suffer more attenuation than those from sources above the Arecibo Observatory facility. The efficiency at 1 kHz of a 70 km altitude end-on source with respect to a vertical, ground-based source was found to be approximately 15% at the HIPAS location; during a polar cap absorption event, (PCA), the efficiency is reduced to 4%. Contour plots of the ELF/VLF magnetic field strengths are presented for both locations, the Arecibo Observatory and the HIPAS facilities.
机译：该文件描述了极低频/极低频ELF / VLF，1-5 kHz辐射从位于电离层D区和低E区（60-85 km）的源向远程接收的传播的理论研究在地球表面的位置。它为分析过去的实验结果和计划未来的实验提供理论支持，以创建一个使用高频（HF）电离层电流加热修改的ELF / VLF通信系统。对阿雷西博天文台的HF天线阵列的分析确定，旁瓣中有足够的功率来改变电离层，从而形成ELF / VLF源阵列。为电离层源阵列计算的ELF / VLF频率响应与实验测量的数据进行了很好的比较。使用基于互易性的模型，详细研究了电离层源辐射到地球电离层波导的耦合以及辐射向接收站点的传播。电离层源位于阿雷西博天文台和大功率极光模拟（HIPAS）HF加热设施的地理坐标处。确定了一般特性：信号损耗主要由波导内的传播损耗决定；最小衰减信号显示为1 kHz；当前元件的尾端定向导致最强的辐射； HIPAS设施上方的ELF / VLF源发出的信号比阿雷西博天文台设施上方的信号遭受的衰减更大。在HIPAS位置发现，相对于垂直的地面源，70 km高度的固定源在1 kHz时的效率约为15％。在极性帽吸收事件（PCA）中，效率降低到4％。在这两个地点（阿雷西博天文台和HIPAS设施）都显示了ELF / VLF磁场强度的等高线图。

著录项

  • 作者

    CARROLL, KENNETH JAMES.;

  • 作者单位

    The Pennsylvania State University.;

  • 授予单位 The Pennsylvania State University.;
  • 学科 Engineering Electronics and Electrical.
  • 学位 Ph.D.
  • 年度 1986
  • 页码 310 p.
  • 总页数 310
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 无线电电子学、电信技术;
  • 关键词

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