Dayside magnetopause reconnection and flux transfer events under radial interplanetary magnetic field (IMF): BepiColombo Earth-flyby observations - Archive ouverte HAL Access content directly
Journal Articles Annales Geophysicae Year : 2022

Dayside magnetopause reconnection and flux transfer events under radial interplanetary magnetic field (IMF): BepiColombo Earth-flyby observations

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1
Weijie Sun
  • Function : Author
James A. Slavin
  • Function : Author
Rumi Nakamura
  • Function : Author
Daniel Heyner
  • Function : Author
Karlheinz J. Trattner
  • Function : Author
Johannes Z. D. Mieth
  • Function : Author
Jiutong Zhao
  • Function : Author
Qiu-Gang Zong
  • Function : Author
Yoshifumi Saito

Abstract

This study analyzes the flux transfer event (FTE)-type flux ropes and magnetic reconnection around the dayside magnetopause during BepiColombo's Earth flyby. The magnetosheath has a high plasma β (∼ 8), and the interplanetary magnetic field (IMF) has a significant radial component. Six flux ropes are identified around the magnetopause. The motion of flux ropes together with the maximum magnetic shear model suggests that the reconnection X-line possibly swipes BepiColombo near the magnetic equator due to an increase in the radial component of the IMF. The flux rope with the highest flux content contains a clear coalescence signature, i.e., two smaller flux ropes merge, supporting theoretical predictions that the flux contents of flux ropes can grow through coalescence. The coalescence of the two FTE-type flux ropes takes place through secondary reconnection at the point of contact between the two flux ropes. The BepiColombo measurements indicate a large normalized guide field and a reconnection rate comparable to that measured at the magnetopause (∼ 0.1).
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Dates and versions

insu-03672031 , version 1 (19-05-2022)

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Attribution - CC BY 4.0

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Weijie Sun, James A. Slavin, Rumi Nakamura, Daniel Heyner, Karlheinz J. Trattner, et al.. Dayside magnetopause reconnection and flux transfer events under radial interplanetary magnetic field (IMF): BepiColombo Earth-flyby observations. Annales Geophysicae, 2022, 40 (2), pp.217-229. ⟨10.5194/angeo-40-217-2022⟩. ⟨insu-03672031⟩
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