金星表面早期存在水，但随着时间的演化这些水已逃离金星。揭示金星大气中的水逃逸过程对分析地球未来演化有着重要意义。尽管金星无全球内禀磁场，但太阳风与金星电离层的相互作用形成了诱发磁层，并在金星夜侧形成了磁尾结构。金星快车卫星数据的研究表明在金星磁尾电流片中存在磁重联现象，并指出磁重联过程是金星大气中水逃逸机制之一。本项目拟利用金星快车卫星提供的近9年观测数据，筛选出金星磁尾电流片中具有磁重联特征的事例，从统计上分析这些事件前后时段中电流片特征的差异，明确金星磁重联期间电流片的变化特征；拟分析金星磁尾重联事件的发生率和发生区域，研究太阳活动高、低年期间磁重联这些特征的差异，阐明太阳活动对金星磁尾磁重联的影响。对金星磁尾磁重联特征的系统研究，将有助于我们深入理解金星诱发磁层中的动力学过程，明确磁重联过程在金星大气中水逃逸过程中的重要性。

There was water in the early surface of Venus, but the water had escaped from Venus during its evolution. Revealing the water escape process in the Venusian atmosphere is of great significance for analyzing the future evolution of the Earth. Although Venus has no global intrinsic magnetic field, the interaction between the solar wind and the Venusian ionosphere forms an induced magnetosphere, and also a magnetotail is formed on the night side of Venus. The Venus Express observations show that there is magnetic reconnection in the Venusian magnetotail current sheet, and it is suggested that the magnetic reconnection process is one of the water escape mechanisms in the Venusian atmosphere. This project intends to use the observation data provided by Venus Express for nearly 9 years to screen out the magnetic reconnection events in the magnetotail current sheet. The differences in current sheet characteristics in the periods before and after these events will be statistically analyzed to clarify the changes of the current sheet during magnetic reconnections. We will also study the occurrence rate and location of the magnetic reconnection in the Venusian magnetotail, and analyze the differences of the characteristics of the magnetic reconnection during high and low solar activities to clarify the effect of the solar activity on the magnetic reconnection in the Venusian magnetotail. The systematic study of the magnetic reconnection characteristics in the Venusian magnetotail will help us to understand the dynamic process in the Venusian induced magnetosphere and to clarify the importance of the magnetic reconnection process in the water escape process in the Venusian atmosphere.