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Journal Articles Annales Geophysicae Year : 2021

Venus's induced magnetosphere during active solar wind conditions at BepiColombo's Venus 1 flyby

Martin Volwerk
  • Function : Author
Beatriz Sánchez-Cano
Daniel Heyner
  • Function : Author
Ali Varsani
  • Function : Author
Johannes Mieth
  • Function : Author
Stefano Orsini
  • Function : Author
Wolfgang Baumjohann
David Fischer
  • Function : Author
Yoshifumi Futaana
Richard Harrison
  • Function : Author
Harald Jeszenszky
  • Function : Author
Iwai Kazumasa
  • Function : Author
Gunter Laky
  • Function : Author
Herbert Lichtenegger
  • Function : Author
Anna Milillo
  • Function : Author
Yoshizumi Miyoshi
  • Function : Author
Rumi Nakamura
  • Function : Author
Ferdinand Plaschke
  • Function : Author
Ingo Richter
  • Function : Author
Sebastián Rojas Mata
  • Function : Author
Yoshifumi Saito
Daniel Schmid
  • Function : Author
Daikou Shiota
  • Function : Author
Cyril Simon Wedlund
  • Function : Author

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.
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Dates and versions

insu-03672403 , version 1 (19-05-2022)

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Attribution - CC BY 4.0

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Martin Volwerk, Beatriz Sánchez-Cano, Daniel Heyner, Sae Aizawa, Nicolas André, et al.. Venus's induced magnetosphere during active solar wind conditions at BepiColombo's Venus 1 flyby. Annales Geophysicae, 2021, 39, pp.811-831. ⟨10.5194/angeo-39-811-2021⟩. ⟨insu-03672403⟩
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