The 3D Direct Simulation Monte Carlo Study of Europa’s Gas Plume

Wei Ling Tseng, Ian Lin Lai*, Wing Huen Ip, Hsiang Wen Hsu, Jong Shinn Wu

*此作品的通信作者

研究成果: 雜誌貢獻期刊論文同行評審

摘要

Europa has been spotted as having water outgassing activities by space-and ground-based telescopes as well as reanalysis of the Galileo data. We adopt a 3D Direct Simulation Monte Carlo (DSMC) model to investigate the observed plume characteristics of Europa assuming that supersonic expansion originated from the subsurface vent. With a parametric study of the total gas production rate and initial gas bulk velocity, the gas number density, temperature and velocity information of the outgassing plumes from various case studies were derived. Our results show that the plume gases experience acceleration through mutual collisions and adiabatic cooling when exiting from the surface. The central part of the plume with relatively large gas production rates (1029 and 1030 H2 O s−1) was found to sustain thermal equilibrium and near continuum condition. Column density maps integrated along two different viewing angles are presented to demonstrate the importance of the projection effect on remote sensing diagnostics. Finally, the density profiles at different altitudes are provided to prepare for observations of Europa’s plumes including upcoming spacecraft missions such as JUICE and Europa Clipper.

原文英語
文章編號261
期刊Universe
8
發行號5
DOIs
出版狀態已發佈 - 2022 5月

ASJC Scopus subject areas

  • 物理與天文學 (全部)

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