Venus's induced magnetosphere during active solar wind conditions at BepiColombo's Venus 1 flyby
Venus's induced magnetosphere during active solar wind conditions at BepiColombo's Venus 1 flyby
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DOI：
10.5194/angeo-39-811-2021
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发表时间：
2021-05
影响因子：
1.9
通讯作者：
M. Volwerk;B. Sánchez–Cano;D. Heyner;S. Aizawa;N. André;A. Varsani;J. Mieth;Wolfgang Baumjohann
中科院分区：
文献类型：
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作者：
M. Volwerk;B. Sánchez–Cano;D. Heyner;S. Aizawa;N. André;A. Varsani;J. Mieth;Wolfgang Baumjohann
抽象的。在两次金星飞越中，比皮科伦坡使用重力辅助操作最终到达水星，第一次发生在2020年10月15日。通过弓形激波后，航天器沿着感应磁尾飞行，主要沿YVSO方向穿越。本文讨论了比佩科伦坡水星行星轨道器磁强计(MPO-MAG)的数据，并得到了另外三台等离子体仪器的支持：行星离子相机(PICAM)、水星电子分析仪(MEA)和辐射监测器(BERM)。在弓形激波交叉的背后，磁场显示出一种与环绕行星的行星际磁场相连的磁力线一致的覆盖模式。这次飞越显示了一个非常活跃的磁尾，例如，在大约7分钟的时间里有强烈的拍打运动。这一活动是由太阳风条件驱动的。就在这次飞越之前，金星的感应磁层受到了一次隐形的日冕物质抛射的影响，在飞越过程中，后方仍与其相互作用。这次飞越是研究金星诱导磁尾的全长和结构的独特机会，表明该尾巴很可能仍然存在于约48金星半径处。
Abstract. Out of the two Venus flybys that BepiColombo uses as a gravity assist manoeuvre to finally arrive at Mercury, the first took place on 15 October 2020. After passing the bow shock, the spacecraft travelled along the induced magnetotail, crossing it mainly in the YVSO-direction. In this paper, the BepiColombo Mercury Planetary Orbiter Magnetometer (MPO-MAG) data are discussed, with support from three other plasma instruments: the Planetary Ion Camera (PICAM), the Mercury Electron Analyser (MEA) and the radiation monitor (BERM). Behind the bow shock crossing, the magnetic field showed a draping pattern consistent with field lines connected to the interplanetary magnetic field wrapping around the planet. This flyby showed a highly active magnetotail, with, e.g., strong flapping motions at a period of ~7 min. This activity was driven by solar wind conditions. Just before this flyby, Venus's induced magnetosphere was impacted by a stealth coronal mass ejection, of which the trailing side was still interacting with it during the flyby. This flyby is a unique opportunity to study the full length and structure of the induced magnetotail of Venus, indicating that the tail was most likely still present at about 48 Venus radii.