中国空间科学技术（中英文）2025，Vol.45Issue(4)：23-36,14.DOI:10.16708/j.cnki.1000-758X.2025.0055
基于多频率磁感应响应的冰卫星冰下海洋性质反演研究
A study on subsurface ocean property inversion of icy moons using multi-frequency magnetic induction response
摘要
Abstract
The icy moons in the Solar System are of great scientific interest due to their potential subsurface oceans.Single-frequency magnetic induction response is limited in its sensitivity to the depths of conductive layers and often suffers from parameter degeneracy during inversion,making it challenging to uniquely determine the conductivity and thickness of subsurface oceans.The feasibility of the multi-frequency magnetic induction response method in inferring the properties of subsurface oceans in icy moons is investigated,and Jupiter's moon,Europa,is selected as a case study.The induced magnetic field of Europa is first simulated utilizing a specific internal structure model and a time-varying field extracted from Jovian magnetospheric models.Based on multiple sets of simulated data,a multi-start trust-region-reflective optimization method is applied to invert the ocean conductivity and thickness.The effects of noise levels,parameter combinations,and detection conditions(e.g.,detection timing and orbital configurations)on the inversion results are also analyzed and discussed.The results indicate that,under high signal-to-noise ratio(SNR),multi-frequency magnetic induction response can effectively reduce the degeneracy between ocean conductivity and thickness.It provides more accurate parameter estimates compared with single-frequency magnetic induction response in a certain parameter space,but further information is still required to determine the unique and reasonable solution.When SNR decreases due to poor detection conditions or large noise,the ability of certain frequencies to constrain parameters is weakened,leading to the reduction of multi-frequency magnetic induction response inversion accuracy.关键词
冰卫星/木卫二/感应磁场/内部结构/深空探测Key words
icy moons/Europa/induced magnetic field/internal structure/deep space exploration分类
天文与地球科学引用本文复制引用
王玉洁,李希之,孔大力..基于多频率磁感应响应的冰卫星冰下海洋性质反演研究[J].中国空间科学技术（中英文）,2025,45(4):23-36,14.基金项目
国家自然科学基金(12250013) （12250013）
