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

oleh: W. Sun, J. A. Slavin, R. Nakamura, D. Heyner, K. J. Trattner, J. Z. D. Mieth, J. Zhao, Q.-G. Zong, S. Aizawa, S. Aizawa, N. Andre, Y. Saito

Format: Article
Diterbitkan: Copernicus Publications 2022-04-01

Deskripsi

<p>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 <span class="inline-formula"><i>β</i></span> (<span class="inline-formula">∼</span> 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 (<span class="inline-formula">∼</span> 0.1).</p>