Venus's induced magnetosphere during active solar wind conditions at BepiColombo's Venus 1 flyby
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Published:2021-09-17
Issue:5
Volume:39
Page:811-831
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ISSN:1432-0576
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Container-title:Annales Geophysicae
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language:en
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Short-container-title:Ann. Geophys.
Author:
Volwerk MartinORCID, Sánchez-Cano BeatrizORCID, Heyner Daniel, Aizawa SaeORCID, André Nicolas, Varsani AliORCID, Mieth Johannes, Orsini Stefano, Baumjohann WolfgangORCID, Fischer DavidORCID, Futaana YoshifumiORCID, Harrison Richard, Jeszenszky Harald, Kazumasa IwaiORCID, Laky Gunter, Lichtenegger Herbert, Milillo AnnaORCID, Miyoshi Yoshizumi, Nakamura Rumi, Plaschke FerdinandORCID, Richter IngoORCID, Rojas Mata Sebastián, Saito YoshifumiORCID, Schmid DanielORCID, Shiota Daikou, Simon Wedlund CyrilORCID
Abstract
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 (SERENA-PICAM) of the SERENA suite, the Mercury Electron Analyser (MEA), and the BepiColombo 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.
Funder
Bundesministerium für Wirtschaft und Energie Science and Technology Facilities Council Austrian Science Fund Deutsches Zentrum für Luft- und Raumfahrt Centre National d’Etudes Spatiales Österreichische Forschungsförderungsgesellschaft Swedish National Space Agency
Publisher
Copernicus GmbH
Subject
Space and Planetary Science,Earth and Planetary Sciences (miscellaneous),Atmospheric Science,Geology,Astronomy and Astrophysics
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