Influence of an Upstream Dynamic Pressure Pulse on Venus–Solar Wind Interaction by Multispecies Magnetohydrodynamic Simulation

As an unmagnetized planet, Venus does not have a global dipole magnetic field like Earth. The solar wind interacts directly with the Venusian ionosphere. In this paper, the interaction between solar wind and the Venusian upper atmosphere is investigated by conducting a three-dimensional multispecies...

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Bibliographic Details
Published in:The Astrophysical journal 2023-12, Vol.958 (2), p.142
Main Authors: Li, Yun, Xiong, Ruijing, Lu, Haoyu, Cao, Jinbin, Zhu, Tianle, Li, Guokan, Li, Shibang
Format: Article
Language:English
Subjects:
Astrophysics
Carbon dioxide
Chemical reactions
Cobalt
Dipoles
Dynamic pressure
Ionosphere
Magnetic fields
Magnetohydrodynamic simulation
Magnetohydrodynamics
Planetary ionospheres
Planetary magnetic fields
Recovery time
Saturn
Solar magnetic field
Solar wind
Upper atmosphere
Venus
Venus ionosphere
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Summary:As an unmagnetized planet, Venus does not have a global dipole magnetic field like Earth. The solar wind interacts directly with the Venusian ionosphere. In this paper, the interaction between solar wind and the Venusian upper atmosphere is investigated by conducting a three-dimensional multispecies magnetohydrodynamic (MHD) model, in which the Venusian ionosphere is developed self-consistently by considering chemical reactions among four major ion species (H + , O 2 + , O + , and CO 2 + ). Based on this developed MHD model, we mainly study the effects of the impulsive solar wind dynamic pressure on the interaction process. Simulation results reveal that the locations of the bow shock and magnetic pileup boundary show an abrupt compression, then expansion, and finally shrinkage to reach a new steady state with the influence of the impulsive dynamic pressure. The recovery time of the large-scale magnetic field is a few minutes. In addition, the peak escape fluxes are enhanced by about 1 order of magnitude due to the increased solar wind dynamic pressure pulse.
ISSN:0004-637X
1538-4357
DOI:10.3847/1538-4357/acfca7