电离层电急流的人工调制

Artificial modulation of ionospheric electrojet by powerful HF radio waves

由基本的磁离子理论出发,构造了大功率电波调制电离层电急流的自洽理论模型。利用此模型,计算了电离层D/E区高度上电子温度随加热时间的变化,以及不同高度上的加热时间和冷却时间。基于方波脉冲的入射方式,详细地研究了加热区电离层电导率和赤道电急流的振荡过程。计算结果表明,地面入射的大功率电波能有效地调制电离层中存在的大尺度直流电流,而且该调制电流可以作为ELF/VLF电波的辐射源。最后简单地分析了在未来实际工程应用中所需要解决的问题。

In terms of magneto-ionic theory, a self-consistent model of ionospheric electrojet artificially modulated by powerful HF radio waves is presented. Using this model, evolution profile of electron temperature with heating time in ionospheric D/E region, heating and cooling time scale, are calculated in this paper. For specific square wave modulation modes and typical ionospheric conditions, oscillations process of ionospheric conductivity and electrojet are studied in details. Calculated results show that large-scale DC currents flow in lower ionosphere can be efficiently modulated by powerful HF radio waves, and the modulated currents can be acted as radiation source of ELF/VLF radio waves. Finally, some practical problems met in future engineering applications are pointed out.