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Forward modeling for “earth-ionosphere” mode electromagnetic field

  • Geological, Civil, Energy and Traffic Engineering
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Abstract

A fixed artificial source (greater than 200 kW) was used and the source location was selected at a high resistivity region to ensure high emission efficiency. Some publications used the “earth-ionosphere" mode in modeling the electromagnetic (EM) fields with the offset up to a thousand kilometer, and such EM fields still have a signal/noise ratio of 10–20 dB. This means that a new EM method with fixed source is feasible, but in their calculation, the displacement in air was neglected. In this work, some three-layer modeling results were presented to illustrate the basic EM fields’ characteristics in the near, far and waveguide areas under “earth-ionosphere” mode, and a standard is given to distinguish the boundary of near, far and waveguide areas. Due to the influence of the ionosphere and displacement current in the air, the “earth-ionosphere” mode EM fields have an extra waveguide zone, where the fields’ behavior is very different from that of the far field zone.

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Authors and Affiliations

  1. Key Laboratory of Metallogenic Prediction of Nonferrous Metals of Ministry of Education, Central South University, Changsha, 410083, China

    Di-quan Li  (李帝铨) & Wei Xie  (谢维)

  2. School of Geosciences and Info-Physics, Central South University, Changsha, 410083, China

    Di-quan Li  (李帝铨) & Wei Xie  (谢维)

  3. Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing, 100029, China

    Qing-yun Di  (底青云) & Miao-yue Wang  (王妙月)

Authors
  1. Di-quan Li  (李帝铨)
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  2. Wei Xie  (谢维)
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  3. Qing-yun Di  (底青云)
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  4. Miao-yue Wang  (王妙月)
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Corresponding author

Correspondence to Wei Xie  (谢维).

Additional information

Foundation item: Projects(41204054, 41541036, 41604111) supported by the National Natural Science Foundation of China

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Li, Dq., Xie, W., Di, Qy. et al. Forward modeling for “earth-ionosphere” mode electromagnetic field. J. Cent. South Univ. 23, 2305–2313 (2016). https://doi.org/10.1007/s11771-016-3288-5

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  • DOI: https://doi.org/10.1007/s11771-016-3288-5

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