Japan Geoscience Union Meeting 2023

Presentation information

[E] Online Poster

P (Space and Planetary Sciences ) » P-EM Solar-Terrestrial Sciences, Space Electromagnetism & Space Environment

[P-EM10] Dynamics of Magnetosphere and Ionosphere

Thu. May 25, 2023 10:45 AM - 12:15 PM Online Poster Zoom Room (2) (Online Poster)

convener:Akiko Fujimoto(Kyushu Institute of Technology), Akimasa Ieda(Institute for Space-Earth Environmental Research, Nagoya University), Yuka Sato(Nippon Institute of Technology), Shun Imajo(Data Analysis Center for Geomagnetism and Space Magnetism, Graduate School of Science, Kyoto University)

On-site poster schedule(2023/5/24 17:15-18:45)

10:45 AM - 12:15 PM

[PEM10-P08] Outflow jets from lobe reconnection and their relationship to shear flow

*Haruto Koike1, Satoshi Taguchi1 (1.Department of Geophysics, Graduate School of Science, Kyoto University)


Keywords:lobe reconenction, shear flow, northward IMF

One of the key parameters of magnetic reconnection is shear flow which is parallel to the reconnecting field. Some simulation studies and theoretical predictions have suggested that the reconnection rate and the outflow jet speed can be reduced as shear flow increases. On the other hand, others report that the reconnection rate is not necessarily affected by the existence of shear flow. Further studies need to be done to understand how shear flow affects the reconnection process. For northward IMF, reconnection can occur at high latitudes of the Earth’s magnetopause, where the magnetosheath flow in the tailward direction acts as shear flow. In this study, we took the lobe reconnection events from the observation by the Cluster satellites and examined the relationships of the ion outflow jet to the magnetosheath tailward flow. The result from the analysis has shown that there is a tendency for the ion outflow jet to increase as the speed of the magnetosheath flow tangential to the magnetopause current sheet increases. This indicates that ions are more greatly accelerated through the lobe reconnection as shear flow increases. We will discuss this tendency in terms of the turbulent structure of the Hall electric field in the ion diffusion region, which is caused by the complicated ion distribution consisting of the tailward magnetosheath flow and the earthward outflow jet.