VLF/HF电波加热及电离层扰动响应

电波加热是人工扰动电离层的重要技术手段之一，加热引起的强烈电离层扰动可影响通信导航等电磁波信号的传播，因此电波加热具有重要的科学研究及军事应用价值。近年来大量卫星观测证实加热在顶部电离层的影响效应，为电离层物理及圈层耦合研究提供非常好的实例支撑。本项目将利用连续6年的DEMETER卫星观测数据，提取大功率VLF和HF人工源激发的顶部电离层及共轭区加热扰动事件，研究不同频段电磁扰动信息的时空传播特征，和扰动时区内等离子体参量的演化规律和相关关系。在此基础上，优化ELF/VLF电磁波在岩石层-大气层-电离层各层中的传播模型和HF电波加热引起的不同层位等离子体参量扰动和离子运移响应，以卫星和地基实测资料作为约束验证条件，解析加热过程中电离层不规则体和电磁辐射波的激发机制及其相互耦合过程。本项目的研究将有利于完善地球圈层耦合模型，对中国电磁卫星开展电离层加热试验也具有重要的指导意义和应用价值。

Radio wave heating is one of the technologies to artificially disturb the ionosphere, where their induced intense ionospheric perturbations will affect significantly the electromagnetic wave signals used in communication, navigation etc., so the study in ionospheric heating by radio waves is important for scientific research and military application. In recent years, a lot of observations at topside ionosphere by satellite verify the influences from ground-based ionospheric heating, which give good support for research on ionospheric physics and spheres coupling theory. In this project, we will use the 6-year DEMETER satellite data, to extract the topside ionospheric heating events over the powerful VLF and HF transmitters and their conjugate geomagnetic regions, to study the propagation characteristics of disturbed electromagnetic signals at different frequency band, to summarize the evolutional laws in plasma parameters and analyze their relationship within the disturbed time period and regions. Based on the results above, the propagation model of ELF/VLF electromagnetic waves will be improved, and the disturbed amplitude in plasma parameters and ion movement due to HF wave heating will be calculated at different layers of ionosphere. With the actual observations by satellites and other ground-based information as constraints and verification, the triggering mechanism for ionospheric regularities and electromagnetic emissions will be studied, and the coupling theories among them will be investigated. The results in this project are beneficial for improving the earth spheres coupling models, and also have guiding significance and application values in future heating experiments on China Seismo-Electromagnetic Satellite（CSES）.