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Theoretical Study on ion escape in Martian Atmosphere

Chinese Physics Letters 2007年第1期24卷 298-301页

作者：史建魁刘振兴 Klaus TORKAR Tielong ZHANG State Key Laboratory for Space Weather Center for Space Science and Applied Research Chinese Academy of Sciences Beijing 100080 Space Research Institute Austrian Academy of Sciences A-8042 Graz Austria

Based on the observation that Martian magnetic moment is gradually reducing from the ancient to the present, we investigate the O^＋ ion flux distribution along magnetic field lines and the ion escaping flux in Martian tail with different assumed Martian magnetic moments. The results show that the O^＋ ion flux along magnetic field lines decreases with distance from Mars; the ion flux along the field line decreases more quickly if the magnetic moment is larger; the larger the magnetic moment, the smaller the ion escaping flux in the Martian tail. The ion escaping flux depends on Z-coordinate in the Martian tail. With decrease of the magnetic moment, the ion escaping flux in the Martian tail increases. The results are significant for studying the water loss from Mars S uFface.

关键词： Mars surface Mars atmosphere Mars Mars magnetic field ion fluxes Magnetic fields ion escape

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Three-dimensional Multispecies MHD Simulation of the Effects of Crustal Magnetic Fields on ion escape from Mars

Three-dimensional Multispecies MHD Simulation of the Effects...

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2019年中国地球科学联合学术年会

作者： Yun Li 吕浩宇李仕邦李国刊 Beihang Universtiy

Without global magetosphere, the solar wind interacts directly with the Martian ionosphere, leading to the ion escape from the planet. It is suggested that the crustal magnetic fields scattered on the surface of Mars can influence the ion escape to some extent. However, futher investigations are still demanded on whether the weak intrinsic magnetic field protects the ionosphere from erosion or not. Three-dimensional multispecies MHD model is established to study the interaction of solar wind with Mars and calculate the escape rates for the different ion species. In this work, a numerical case without planetary magenetic field is performed to make comparision with the case induding dipole magnetic field. The simulation results indicate that the ion escape rates are enhanced significantly with the weak intrinsic magnetic field considered.

关键词： Mars MHD simulation crustal field ion escape

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Ablation of Venusian oxygen ions by unshocked solar wind

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Science Bulletin 2017年第24期62卷 1669-1672页

作者： Yong Wei Markus Fraenz Edward Dubinin Weixing Wan Tielong Zhang Zhaojin Rong Lihui Chai Jun Zhong Rixiang Zhu Yoshifumi Futaana Stas Barabash Key Laboratory of Earth and Planetary Physics Institute of Geology and Geophysics Chinese Academy of Sciences Beijing 100029 China Max-Planck-lnstitute for Solar System Research Goettingen 37077 Germany Space Research Institute Austrian Academy of Sdences Graz 8042 Austria Swedish Institute of Space Physics Kiruna SE-981 28 Sweden College of Earth Sciences University of Chinese Academy of Sciences Beijing 100049 China Institutions of Earth Science Chinese Academy of Sciences BeUing 100029 China

As an Earth-like planet Venus probably had a primordial dipole field for several million years after formation of the *** this dipole field eventually vanished the ionosphere of Venus has been exposed to the solar *** solar wind is shocked near Venus,and then scavenges the ionospheric particles through the magnetosheath and the *** escape rate of oxygen ions(O^+)estimated from spacecraft observations over the past several decades has manifested its importance for the evolution of planetary habitability,considering the accumulated effect over the history of ***,all the previous observations were made in the shocked solar wind and/or inside the wake,though some simulations showed that unshocked solar wind can also ablate O^+*** we report Venus Express observations of O^+ions in the unshocked solar wind during the solar *** observations suggest that these O^+ions are accelerated by the unshocked solar wind through pickup *** estimated O^+escape rate,2.1×10^(24) ions/s,is comparable to those measured in the shocked solar wind and the *** escape rate could result in about 2 cm global water loss over 4.5 billion *** results suggest that the atmospheric loss at unmagnetized planets is significantly underestimated by previous observations,and thus we can emphasize the importance of an Earth-like dipole for planetary habitability.

关键词： Venus ion escape Planetary habitability

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