世界地震译丛2026，Vol.57Issue(4)：394-426,33.DOI:10.19975/j.dqyxx.2025-052
类地行星空间环境全球模拟方法及特性对比研究
Comparative study of global simulation methods and characteristics of the space environments of terrestrial planets
摘要
Abstract
The long-term atmospheric evolution and ion escape of unmagnetized terrestrial planets under con-tinuous solar wind erosion are fundamental to understanding their habitability,water loss mechanisms,and evolu-tionary pathways.Although Venus and Mars both lack a global intrinsic magnetic field,their ionospheric structures,surface magnetic field distributions,and atmospheric compositions differ significantly,leading to distinct types of induced magnetospheres and ion acceleration environments.Despite extensive observational and modeling efforts,the physical mechanisms governing the differences in their electromagnetic structures,ion dynamics,and escape fluxes remain insufficiently constrained.To address this issue,we develop and employ a unified three-dimensional multi-fluid magnetohydrodynamic(MHD)model to systematically compare the global plasma structures,electric field systems,heavy ion distributions,and escape characteristics of Venus and Mars under solar wind interaction,and further evaluate the performance of Mars four-species single-fluid,four-species multi-fluid,and ten-species multi-fluid models. Our results show that the ion escape processes of both planets are jointly regulated by the solar wind dynamic pressure,Hall electric field,and ionosphere-magnetosphere coupling.Owing to its dense ionosphere and strong photochemical processes,Venus exhibits a pronounced magnetic pileup region,elevated heavy-ion densities,and a nearly symmetric electromagnetic structure.In contrast,Mars is strongly influenced by spatially variable crustal magnetic fields and more prominent Hall effects,which produce complex ion-scale structures and acceleration pathways at the magnetic pileup boundary,dayside plume region,and magnetotail.The Hall electric field contributes a substantially larger fraction of the total electric field at Mars than at Venus,even dominating the local electric field direction in plume source regions and plasma sheet locations,indicating a stronger electromagnetic accelera-tion capability under comparable upstream conditions. Comparisons between simulations and observations show that the ten-species multi-fluid model most accurately reproduces the bow shock and magnetic pileup positions,ionospheric density profiles,local electric field strengths,and overall ion escape rate(～1.4×1025 s-1).The model also reveals a pronounced mass dependence in Martian ion escape:light ions(e.g.,O+)are preferentially accelerated into the magnetotail and dominate tailward escape,where-as heavy ions(e.g.,O+2,CO+2)primarily escape through dayside plume structures.These patterns reflect the com-bined effects of multi-species coupling,Hall physics,and crustal magnetic field geometry. In summary,Hall electric fields,multi-ion coupling,and localized magnetic field structures are identified as key controlling factors that shape the electromagnetic configuration,ion transport pathways,and long-term atmo-spheric loss of unmagnetized terrestrial planets.The findings deepen our understanding of the physical divergence between Venus and Mars and provide new theoretical constraints for modeling atmospheric evolution and assess-ing planetary habitability.关键词
金星空间环境/火星空间环境/Hall MHD数值模拟/电场系统/离子逃逸Key words
Venus's space environment/Mars's space environment/Hall MHD model/electric field systems/ion escape分类
天文与地球科学引用本文复制引用
吕浩宇,赵嘉宁,王剑轩,宋奕辉,李仕邦,陈旎菡,曹宇辰,王启梦..类地行星空间环境全球模拟方法及特性对比研究[J].世界地震译丛,2026,57(4):394-426,33.基金项目
国家自然科学基金资助项目(42241114,12150008,42404176) （42241114,12150008,42404176）
中国博士后科学基金会国家资助博士后研究人员计划(GZC20233367,YJA20250022) Supported by the National Natural Science Foundation of China(Grant Nos.42241114,12150008,42404176)and the Postdoctoral Fellowship Program of CPSF(Grant Nos.GZC20233367,YJA20250022) （GZC20233367,YJA20250022）
