Numerical simulations on origin of Galilean moons' magnetic anomalies

作     者：JIAO LiGuo KUANG WeiJia MA ShiZhuang 

作者机构：Laboratory of Computational Geodynamics College of Earth Sciences Graduate University of Chinese Academy of Sciences Beijing 100049 China NASA Goddard Space Flight Center Greenbelt MD 20771 USA 

出 版 物：《Science China Earth Sciences》 (中国科学（地球科学英文版）)

年 卷 期：2011年第54卷第12期

页      面：1754-1760页

核心收录：

学科分类：070801[理学-固体地球物理学] 06[历史学] 060207[历史学-专门史] 07[理学] 0708[理学-地球物理学] 0712[理学-科学技术史(分学科，可授理学、工学、农学、医学学位)] 0602[历史学-中国史] 

基　　金：supported by National Natural Science Foundation of China (Grant No. 40328006) 

主　　题：Galilean moons magnetic fields magneto-convection dynamo 

摘      要：Galileo mission detected the magnetic anomalies originated from Galilean *** anomalies are likely generated in the moons interiors,under the influence of a strong ambient Jovian *** various possible generation mechanisms of the anomalies,we focus on magneto-convection and dynamos in the interiors via numerical *** mimic the electromagnetic environment of the moons,we introduce in our numerical model an external uniform magnetic field B0 with a fixed orientation but varying field *** results show that a finite B0 can substantially alter the dynamo processes inside the *** the ambient field strength B0 increases to approximately 40% of the field generated by the pure dynamo action,the convective state in the core changes significantly:the convective flow decreases by 80% in magnitude,but the differential rotation becomes stronger in much of the fluid layer,leading to a stronger field generated in the *** field morphologies inside the core tend to align with the ambient field,while the flow patterns show the symmetry-breaking effect under the influence of ***,the generated field tends to be temporally more stable.