行星际大尺度扰动的天基PSP/SO卫星“近日探源”和地基IPS射电望远镜“远日遥感”及其观测数据驱动MHD模型

行星际大尺度扰动包括源自太阳的日冕物质抛射CME和共转流相互作用区CIR，驱动地球空间的磁暴和极光增强等响应。随着国际帕克太阳探针PSP和太阳环绕器SO卫星以及我国地基子午工程行星际闪烁IPS射电望远镜的项目执行，行星际扰动研究正迎来PSP/SO卫星“近日探源”和IPS望远镜“远日遥感”的宝贵联测机遇。PSP和SO卫星就位测量太阳风湍流谱，为计算IPS射电波在太阳风中传播的相位调制和强度闪烁提供太阳风背景媒介参数。IPS望远镜的多波束天线指向太阳周边广袤天区，实时遥测行星际等离子体流速，从而预警CME和CIR扰动。本项目拟构建PSP/SO和IPS观测数据驱动的行星际数值磁流体模型，追踪背景太阳风及其CME扰动在行星际空间传播的三维空间结构及其时变演化，揭示行星际CME的传播规律和动力学机制，开展空间天气预报的应用研究，从而为我国子午工程IPS望远镜的观测数据定标和分析奠定物理基础。

The interplanetary disturbances including coronal mass ejection (CME) and corotating interaction regions (CIR) originate from the solar atmosphere, drive the geomagnetic storms and aurora emission enhancement. With the ongoing implementation of the international Parker Solar Probe (PSP) and Solar Orbiter (SO) spacecraft missions as well as the Chinese interplanetary scintillation (IPS) radio telescopes, the research on interplanetary disturbances enter the era of golden age. The IPS facility under construction is within the framework of the Chinese Meridian-II Project. The joint observation of the near-Sun PSP/SO spacecraft and the ground-based IPS telescopes is expected to provide great opportunities for scientific discoveries. The radio waves initially emitted from compact radio sources at remote astronomical distances are detectable by radio telescopes on Earth, and recorded as time-series signals of intensity scintillation. Such radio intensity scintillation known as IPS phenomena is ascribed to radio wave propagation through turbulent plasma of solar wind. How to calculate the phase modulation and intensity scintillation of IPS radio waves relies on the turbulence parameters of solar wind medium, which can be accurately measured by the PSP and SO along their orbits. Using a multi-beam antenna of radio telescope pointing towards the vast sky map around Sun, interplanetary solar wind speed is remotely monitored in real time, and thus CMEs and CIRs are readily detected for an early warning of space weather disturbances. In this proposal, we intend to establish a numerical magnetohydrodynamic (MHD) computerized-tomographic (CT) model of interplanetary space driven by the PSP/SO and IPS observation data, track the three-dimensional spatial structures and temporal evolution of both quasi-steady solar wind flows and transient CME disturbances, discover the propagation laws and dynamic mechanisms of interplanetary CMEs, and conduct applied research of space weather prediction. The accomplishments in this proposal will serve as physical foundation for future calibration and analyses of IPS observation data generated from the Chinese Meridian-II Project.