探日”新篇！我国计划向日地引力平衡L5点发射“羲和二号

Core Viewpoint - The "Xihe II" solar exploration project is set to launch between 2028 and 2029, aiming to position itself at the Sun-Earth L5 point, providing a new observational perspective on solar activities [1][3]. Group 1: Project Overview - The "Xihe II" project is initiated by Nanjing University in collaboration with the Eighth Academy of Aerospace, addressing national space security needs [1]. - The project follows the successful launch of the first solar exploration satellite, "Xihe," in October 2021, marking China's entry into solar exploration [1]. - "Xihe II" will conduct three-dimensional observations of the Sun from a new wavelength and perspective, differing from "Xihe," which orbits Earth [1][3]. Group 2: Technical Aspects - "Xihe II" will be stationed at the L5 point, one of five gravitational balance points between the Earth and the Sun, allowing for stable orbit maintenance with minimal energy consumption [3]. - The design lifespan of "Xihe II" is projected to be seven years, enabling detailed measurements of solar magnetic fields and activities [3]. - The satellite aims to establish a comprehensive three-dimensional physical model of solar eruptions and enhance China's space weather forecasting capabilities [3]. Group 3: Scientific Significance - "Xihe II" will provide a new observational perspective, allowing for advanced warnings of solar activities such as solar flares and coronal mass ejections, potentially offering four to five days of lead time for Earth’s emergency responses [3].