| 摘要: | 研究期間：10108~10207;The Solar corona is the outermost and hottest layer of the solar atmosphere, and Coronal mass ejections (CMEs) are the most violent events in this layer. CMEs eject large amounts of coronal mass and magnetic ux from the Sun to as far as the boundary of the solar system. They can damage our space station, satellites, and disrupt the wireless communications on Earth. The objective of this project is to understand what kind of condition(s) and mechanism(s) would trigger such eruption and allow it to propagate away from the Sun, in the hope that the results would lead to better space-weather forecasts and more accurate predictions of CME occurrence and magnitude. In my previous work on this topic, I have examined two CMEs using 2-D Extreme Ultra-Violet (EUV) images and white-light coronagraphs, along with hard X-ray (HXR) and soft X-ray (SXR) data. In this project, I plan to carry out a statistically signi cant study of CMEs, utilizing the data from several state-of-the-art instruments, and collaborate with the solar physics group at NCKU, speci cally, Prof. C.-Z. Cheng and Dr. Y.-H. Yang, who will provide their expertise in CME modelling, solar are, and HXR analysis. This project will consist of two phases. The task for the rst phase is to collect and process the necessary data and information of at least 20 CMEs during the rst year of the project. In the next phase, I plan to rst develop a robust and reliable procedure that can be applied to many events to extract all the correct information from CMEs in a consistent and e cient manner, and then apply the procedure to the CME data collected in the rst phase. My examination strategy is to compare, both quantitatively and qualitatively, the observations and various CME models. The theory most consistent with observations can be used to infer the physics of the observed CMEs, while any discrepancies between the observations and theories can indicate how to improve the existing theories. Since this examination strategy will be applied to a large number of CME events, our results will be statistically signi cant. I plan to divide part of the work into modules of student projects, in which the participated students will learn about CMEs, magnetic reconnections and solar ares, and acquire the computational skills to process and analyze the data from some of the most advanced solar observation instruments. By the end of the project, the large CME database and the reliable examination procedure we developed will be useful for various future studies on CMEs. The results from this investigation will provide the necessary information of the CME physics for the space scientists to design better preventive/protective measures for our space and telecommunication equipments. |
