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Chinese Journal of Space Science ›› 2019, Vol. 39 ›› Issue (1): 55-61.doi: 10.11728/cjss2019.01.055

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Radio Propagation Model of Ionospheric Sporadic E

ZHANG Yabin, WU Jian, XU Zhengwen, XU Bin, XUE Kun, ZHAO Haisheng, CUI Yuguo   

  1. National Key Laboratory of Electromagnetic Environment, China Research Institute of Radiowave Propagation, Qingdao 266107
  • Received:2017-07-11 Revised:2018-04-09 Online:2019-01-15 Published:2019-01-30

Abstract:

Considering the influence of atmospheric refraction, the relationship between the great-circle propagation distance and the elevation angle under different height Es layers is calculated. Based on the numerical model of ion density of the Es layer, and using an autocorrelation function of the fluctuation of electron density given by modified Bessel functions of the fifth, the reflection and scattering models are built considering the scale of irregularities. The relationships between the attenuation of the VHF oblique incident propagation of the Es layer and the frequency are simulated by the models. For the reflection model, the thicker the Es layer is, the greater the attenuation is. For the scattering model, the larger the vertical and horizontal drift scale are, the greater the attenuation is under the same horizontal scale of Es layer irregularities. However, if the vertical and horizontal drifts are same, the attenuation is inversely proportional to the horizontal scale. In reflection and scattering models, the higher the f0Es is, the smaller the attenuation is while the higher the operating frequency of radio waves is, the greater the attenuation is. The results also agree well with the observations of Es propagation path. Es reflection/scattering mechanism is clear for different intensity of ionosphere.

Key words: Sporadic E, Radio propagation, Reflect model, Scatter model

CLC Number: