Radio Wave Propagation Effects Produced by Chemical Releases in the Ionosphere  

作　　者：HU Yaogai ZHAO Zhengyu XIANG Wei 

机构地区：[1]School of Electronic Information, Wuhan University, Wuhan430072, Hubei, China

出　　处：《Wuhan University Journal of Natural Sciences》2011年第3期249-254,共6页武汉大学学报（自然科学英文版）

基　　金：Supported by the National Natural Science Foundation of China (60701020);the China Post-Doctoral Science Foundation (20080430988,200801321);the Fundamental Research Funds for the Central Universities (3103001)

摘　　要：As an effective means to actively modify the ionosphere, chemical release can produce artificial ionospheric holes as a consequence of ionization depletion, which can greatly impact on radio wave propagation. In this paper, on the basis of the pre-study results on ionospheric disturbances produced by some representative chemical releases, the radio waves propagation effects of ionospheric holes that are produced by two different release species, water （H2O） and sulfur hexafluoride （SF6）, had been investigated and simulated by the three-dimensional （3-D） numerical ray tracing. The results show that 1 the appearance of various artificial ionospheric holes can lead to certain decrease of critical frequency in the ionosphere, and 2 when the wave frequency exceeds the critical frequency, the rays should be multiple reflections or penetrate through the ionospheric hole and focus afterwards with the focus altitude elevated for higher frequencies. This work may provide the necessary theoretical support for chemical release experiments and the evaluation of radio wave propagation effects.As an effective means to actively modify the ionosphere, chemical release can produce artificial ionospheric holes as a consequence of ionization depletion, which can greatly impact on radio wave propagation. In this paper, on the basis of the pre-study results on ionospheric disturbances produced by some representative chemical releases, the radio waves propagation effects of ionospheric holes that are produced by two different release species, water （H2O） and sulfur hexafluoride （SF6）, had been investigated and simulated by the three-dimensional （3-D） numerical ray tracing. The results show that 1 the appearance of various artificial ionospheric holes can lead to certain decrease of critical frequency in the ionosphere, and 2 when the wave frequency exceeds the critical frequency, the rays should be multiple reflections or penetrate through the ionospheric hole and focus afterwards with the focus altitude elevated for higher frequencies. This work may provide the necessary theoretical support for chemical release experiments and the evaluation of radio wave propagation effects.

关 键 词：chemical releases ionospheric hole ray tracing radio wave propagation 

分 类 号：P352.3[天文地球—空间物理学]