木卫二的内部结构模型和海洋层——伽利略探测的最新研究进展  

Internal Structure Models and Subsurface Ocean of Europa -Recent Researches After the Galileo Mission

作　　者：张鸿[1] 张承志[1] 

机构地区：[1]南京大学天文系,南京210093

出　　处：《天文学进展》2002年第3期223-233,共11页Progress In Astronomy

基　　金：国家自然科学基金"九五"重点项目(19833010)资助课题

摘　　要：伽利略探测获得了木卫二的最新探测资料,其更精确的重力探测数据使深入研究木卫二的内部结构成为可能.研究表明,木卫二有着比较复杂的内部结构:最外层是水冰层,中层是岩石幔,中心是金属核仰或Fe-FeS）。但重力探测数据并不能确定水冰层中水的物态.多方面的证据（如理论、地学、磁场等证据）都表明木卫二的表面冰层下存在液体的导电海洋层,其中磁场方面的证据可能最为有力。概述了对木卫二的内部结构模型和海洋层两方面的研究,并推断潮汐演化是木卫二海洋层存在的重要原因.NASA's Galileo mission to Jupiter has allowed major advances in the understanding of Jupiter's moon Europa. More precise geodetic data make it possible to study the internal structure models of Europa, which may have a complex internal structure. But a subsurface ocean can not be identified just based on the gravity field of Europa. Fortunately, the presence of the subsurface ocean can be supported by the theoretical, geological arguments and magnetic field evidence. Relevant studies on the internal structure models and the subsurface ocean of Europa are briefly described in this article. It is pointed out that the tidal evolution is the most possible explanation of the formation of the subsurface ocean of Europa.

关 键 词：木卫二 内部结构模型 拉普拉斯共振 潮汐演化 木星 

分 类 号：P185.4[天文地球—天文学]