LatHyS global hybrid simulation of the BepiColombo second Venus flyby
LatHyS global hybrid simulation of the BepiColombo second Venus flyby
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DOI：
10.1016/j.pss.2022.105499
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发表时间：
2022-05-17
影响因子：
2.4
通讯作者：
Murakami, G.
中科院分区：
文献类型：
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作者：
Aizawa, S.;Persson, M.;Murakami, G.
BepiColombo在2021年8月10日第二次飞越金星期间的等离子体和磁场观测已经过检查，并与新开发的金星环境全球混合模拟LatHyS进行了比较。LatHyS-Venus模拟首先通过与金星快车在平均太阳风条件下获得的观测结果进行比较来验证，然后将其应用于BepiColombo飞越，使用太阳轨道器在金星上游测量的太阳风参数作为输入。模拟证实BepiColombo穿过金星的停滞区，这支持了通过数据分析获得的结果。此外，我们还对BepiColombo轨道上的等离子体参数进行了沿着采样，并构造了两种物质的能谱，对太阳风和行星起源的质子以及行星氧离子进行了观测，并讨论了由于BepiColombo上的等离子体仪器视野有限而可能产生的影响。LatHyS-Venus模拟恰当地捕捉到了最强烈的观测特征，这表明该模型是解释和理解从视野有限的仪器中获得的原位数据的有力工具。在BepiColombo飞越期间，金星上质子和氧离子的估计离子逃逸为ti 1024离子/s的量级，与金星快车在太阳极小期的观测估计相比，这是相同的数量级。
Plasma and magnetic field observations by BepiColombo during its 2nd Venus flyby in August 10, 2021 have been examined and compared with the newly developed global hybrid simulation LatHyS for the Venusian environment. The LatHyS-Venus simulation was first validated by a comparison with Venus Express observations obtained during average solar wind conditions, before it was applied to the BepiColombo flyby using as inputs solar wind parameters measured upstream of Venus by Solar Orbiter. The simulation confirms that BepiColombo passed through the stagnation region of Venus, which supports the results obtained by data analysis. In addition, we have sampled the plasma parameters along the BepiColombo trajectory and constructed the energy spectrum for two species, i.e., protons of both solar wind and planetary origins, and planetary oxygen ions, and discussed the possible effects due to the limited field of views of the plasma instruments onboard BepiColombo. The most intense observational features are properly captured in the LatHyS-Venus simulation, which show that the model is a powerful tool for interpreting and understanding in-situ data obtained from the instruments with a limited field of views. The estimated ion escape for protons and oxygen ions at Venus during the BepiColombo flyby is of the order of ti 1024 ions/s, which is the same order of magnitude compared to the estimation from Venus Express observations at the solar minimum.