The Electromagnetic Field Of The Underground Slf/elf Horizontal Electric Dipole Located In The Isotropical Earth-ionosphere Wave Guide

The characteristic of the Super Low Frequency and the Extremely Low Frequency wave is that the wave length is extremely long and the frequency is extremely low, compared with other frequency band's electromagnetic wave. The attenuation rate of the SLF/ELF is quite small and the penetrability of the SLF/ELF is quite strong. It can penetrate the water deeply and we can receive the signal in the sea. It can be applied to submarine communications in order that it can enhance the safety of the submarine and ensure the communications smoothly. It can also penetrate the rocky and soil deeply and the attenuation rate is relatively small, therefore it can be used to control the bunker located deeply in a large area. The signals of electromagnetic waves in this band can be sent to far away even global, so it is suitable for the long-distance communication. Because it is not easily disturbed by ionospheric storm, even the nuclear explosion, it still doesn't receive the serious interference.Using these characteristics, we may apply it to dive the submarine correspondence, under extremely bad environmental of the future war. The Super Low Frequency and the Extremely Low Frequency wave may become the important emergency way of correspondence. It may also be used for predicting the earthquakes, prospecting the geological and so on. Therefore we should carry on the deep research in the dissemination characteristic of the Super Low Frequency and the Extremely Low Frequency wave.In this paper it main researches the electromagnetic field of the vertical electric dipole in the earth-ionosphere wave guide, and which separately produced on the sphere surface and in the isotropical in SLF/ELF. Then the electromagnetic field of the magnetic dipole is the same as the vertical electric dipole. Next it introduces the electromagnetic field of the horizontal electric dipole in the earth-ionosphere wave guide by the reciprocity theorem, which separately produced above the spherical surface and under the spherical surface. Last it shows that the electromagnetic field of the horizontal electric dipole located in the isotropical earth-ionosphere wave guide, which produced on the ionosphere surface and above the ionosphere surface.In the paper first it shows that the earth and the ionosphere both have good echoing characteristic regarding to the electromagnetic wave in the SLF/ELF and the electromagnetic wave disseminate in the earth-ionosphere wave guide. Therefore the existence of the ionosphere must be considered, so that the electromagnetic wave disseminates forward by the reflections many times between the ground and the ionosphere. In order that the research can be carried esaliy, we think the ionosphere has boundary,in other words the ionosphere has surface impedance, and the earth also has surface impedance. The earth and the ionosphere of the earth-ionosphere wave guide have the same center of a circle. In this paper the isotropical earth-ionosphere wave guide is only considered. in this paper the isotropical earth-ionosphere wave guide is only considered.firstly the electromagnetic field of the vertical electric dipole and the magnetic dipole are obtained, which separately produced on the ground and under the ground. Then using the reciprocity theorem in the earth-ionosphere wave guide, the electromagnetic field of the horizontal electric dipole located under the ground are obtained,which produced under the ground and above the ground, and describe the same situation of the ionosphere. The electromagnetic field of the horizontal electric dipole located under the ground are obtained, which produced on the ionosphere and above the ionosphere. Finally it has carried on the discussion and the comparison with the result.