地球与行星物理论评（中英文）2025，Vol.56Issue(4)：458-473,16.DOI:10.19975/j.dqyxx.2024-049
金星火星电离层小尺度磁通量绳研究
Studies on the small-scale magnetic flux ropes at Venus and Mars
摘要
Abstract
Magnetic flux ropes(MFRs)with twisted magnetic field lines are common in the solar system,most of which can be caused by magnetic reconnection or velocity shear.However,these two mechanisms have diffi-culties in explaining the formation of MFRs observed in the ionosphere of an unmagnetized body,such as Mars and Venus.Here we propose a new mechanism:an azimuthal component of ∇×E can be generated by the differential compression and diffusion at different parts of the flux tube when the tube is sinking into the partially ionized iono-sphere,which generates azimuthal magnetic fields with twisted magnetic field lines and finally gives rise to an ionospheric MFR.We develop a multi-fluid MHD model to study the formation of MFR in the ionospheres of Mars and Venus,and the simulation results are consistent with the observations.We also discuss the different effects of different factors,such as the sinking speed,the ion gyroradius,and the tube radius,which can be used to explain the different altitude dependences of MFRs observed at Mars and Venus.关键词
磁通量绳/多流体MHD/金星/火星Key words
magnetic flux ropes/multi-fluid MHD/Venus/Mars分类
地球科学引用本文复制引用
谢良海,李罗权,李磊,张艺腾,徐晓军..金星火星电离层小尺度磁通量绳研究[J].地球与行星物理论评（中英文）,2025,56(4):458-473,16.基金项目
国家自然科学基金面上资助项目(42174216) （42174216）
中国科学院国家空间科学中心"攀登计划" Supported by the National Natural Science Foundation of China(Grant No.42174216),and the Pandeng Program of National Space Science Center,Chinese Academy of Sciences （Grant No.42174216）
