Theoretical and Experimental Studies Concerning the Interaction of Powerful Radio Waves with the Ionosphere

利用高功率高频加热器对电离层进行加热和改造，已被认为是研究非线性等离子体物理和了解电离层内部动力学的有力手段。拟议方案的目的是发展理论，以便更好地理解实验观测，特别涉及：(A)高频PLs与自然线之间的高度差以及HFPLs与场对齐不规则之间的关系；(B)高频PLs频率上移及其组织高度；(C)等离子体线超调和高频PLs起始高度间隔的扩大；以及(D)产生电子伯恩斯坦模作为二次模拟电磁发射的源波。只要可行，就会启动新的实验。该方法将基于我们早期和最近的工作，包括对场向朗缪尔波的热火焰不稳定性的研究、高频PLs的演化和各种参数不稳定性过程的研究。我们还建议研究电离层等离子体不均匀对高频加热实验结果的影响。***

Heating and modification of the ionosphere by powerful HF heaters have been recognized to be a powerful means to study the nonlinear plasma physics and to understand the internal dynamics of the ionosphere. The proposed program is aimed at developing theories for better understanding of the experimental observations with particular reference to: (a) height difference between HFPLs and natural lines and the correlation between HFPLs and field-aligned irregularities; (b) frequency upshifted HFPLs and their organization altitude; (c) plasma lines overshoot and expansion of originating altitude interval of HFPLs; and (d) generation of electron Bernstein modes as the source waves of secondary simulated EM emission. New experiments will be initiated whenever they are feasible. The approach will be based on our earlier and recent works that include the study of thermal flamentation instability of field-aligned Langmuir wave, evolution of HFPLs and the study of various parametric instability processes. We also propose to study the effects of the ionospheric plasma inhomogeneity on the results of HF heating experiments. ***