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- Title
Dayside magnetopause reconnection and flux transfer events under radial interplanetary magnetic field (IMF): BepiColombo Earth-flyby observations.
- Authors
Sun, Weijie; Slavin, James A.; Nakamura, Rumi; Heyner, Daniel; Trattner, Karlheinz J.; Mieth, Johannes Z. D.; Zhao, Jiutong; Zong, Qiu-Gang; Aizawa, Sae; Andre, Nicolas; Saito, Yoshifumi
- 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).
- Subjects
INTERPLANETARY magnetic fields; MAGNETOPAUSE; MAGNETIC reconnection; MAGNETIC flux
- Publication
Annales Geophysicae (ANGEO) (09927689), 2022, Vol 40, Issue 2, p217
- ISSN
0992-7689
- Publication type
Article
- DOI
10.5194/angeo-40-217-2022