Preprints
https://doi.org/10.5194/angeo-2021-58
https://doi.org/10.5194/angeo-2021-58

  22 Oct 2021

22 Oct 2021

Review status: this preprint is currently under review for the journal ANGEO.

Dayside magnetopause reconnection and flux transfer events: BepiColombo earth-Flyby observations

Weijie Sun1, James A. Slavin1, Rumi Nakamura2, Daniel Heyner3, Karlheinz J. Trattner4, Johannes Z. D. Mieth3, Jiutong Zhao5, Qiu-Gang Zong5, Sae Aizawa6,7, Nicolas Andre6, and Yoshifumi Saito8 Weijie Sun et al.
  • 1Department of Climate and Space Sciences and Engineering, University of Michigan, Ann Arbor, MI 48109, United States
  • 2Space Research Institute, Austrian Academy of Sciences, Schmiedlstraße 6, 8042 Graz, Austria
  • 3Institut für Geophysik und extraterrestrische Physik, Technische Universität Braunschweig, 38106 Braunschweig, Germany
  • 4Laboratory for Atmospheric and Space Physics, University of Colorado, Boulder, CO 80303, USA
  • 5School of Earth and Space Sciences, Peking University, Beijing 100871, China
  • 6Institut de Recherche en Astrophysique et Planétologie, CNRS-UPS-CNES, Toulouse, France
  • 7Department of Geophysics, Graduate School of Science, Tohoku University, Sendai, Japan
  • 8Japan Aerospace Exploration Agency, Institute of Space and Astronautical Science, Kanagawa, Japan

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 corresponds to a high plasma β (~ 8) and the IMF has a significant radial component. Six flux ropes are identified. The motion of flux rope together with the maximum magnetic shear model suggests that the reconnection X-line swipes BepiColombo near the magnetic equator due to an increase of the radial IMF. The flux rope with the highest flux content contains a clear coalescence signature, i.e., two smaller flux ropes merging, supporting theoretical predictions the flux content of flux ropes can grow through coalescence. The secondary reconnection associated with coalescence exhibits a large normalized guide field and a reconnection rate comparable to the reconnection rate measured at the magnetopause (~ 0.1).

Weijie Sun et al.

Status: open (until 15 Dec 2021)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on angeo-2021-58', Anonymous Referee #1, 23 Nov 2021 reply

Weijie Sun et al.

Viewed

Total article views: 382 (including HTML, PDF, and XML)
HTML PDF XML Total Supplement BibTeX EndNote
335 41 6 382 7 1 2
  • HTML: 335
  • PDF: 41
  • XML: 6
  • Total: 382
  • Supplement: 7
  • BibTeX: 1
  • EndNote: 2
Views and downloads (calculated since 22 Oct 2021)
Cumulative views and downloads (calculated since 22 Oct 2021)

Viewed (geographical distribution)

Total article views: 388 (including HTML, PDF, and XML) Thereof 388 with geography defined and 0 with unknown origin.
Country # Views %
  • 1
1
 
 
 
 
Latest update: 04 Dec 2021
Download
Short summary
This paper presents observations of FTE-type flux ropes on the dayside during BepiColombo's Earth flyby FTE-type flux ropes are a well-known feature of magnetic reconnection on the magnetopause and they can be used to constrain the location of reconnection X-lines. Our study suggests that the magnetopause X-line crossed over BepiColombo from the north as it traversed the magnetopause. Moreover, it also strongly supports that coalescence can create larger flux ropes by combining smaller ones.