Japan Geoscience Union Meeting 2016

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International Session (Oral)

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

[P-EM07] Dynamics in magnetosphere and ionosphere

Tue. May 24, 2016 1:45 PM - 3:15 PM 103 (1F)

Convener:*Yoshizumi Miyoshi(Institute for Space-Earth Environmental Research, Nagoya University), Yoshimasa Tanaka(National Institute of Polar Research), Aoi Nakamizo(Applied Electromagnetic Research Institute, National Institute of Information and Communications Technology), Mitsunori Ozaki(Faculty of Electrical and Computer Engineering, Institute of Science and Engineering, Kanazawa University), Shin'ya Nakano(The Institute of Statistical Mathematics), Tomoaki Hori(Institute for Space-Earth Environmental Research, Nagoya University), Chair:Akimasa Ieda(Institute for Space-Earth Environmental Research, Nagoya University)

2:15 PM - 2:30 PM

[PEM07-03] Global MHD simulation study of the vortex at the magnetopause boundary for the southward IMF and steady solar wind conditions

*Kyung Sun Park1, Tatsuki Ogino2, Dae-Young Lee1, Raymond J Walker3, Khan-Hyuk Kim4, Dong-Hun Lee4 (1.Chungbuk National University, 2.ISEE, Nagoya University, 3.IGPP, UCLA, 4.Kyung Hee University)

Keywords:MHD simulation, vortex, reconnection, magnetopause

We have used a high-resolution and three-dimensional global magnetohydrodynamic (MHD) simulation to study the interaction between the steady solar wind and Earth’s magnetosphere during the weak southward IMF. The simulation results show that the vortex like is generated at about = 11.7RE region (1600LT-1700LT) with a vortex size of about 2.9 RE at the inner boundary of magnetosphere. The vortices are propagating tailward with a velocity of 55 km/s up to 86 km/s. Moreover, the quasi-periodic fluctuations of magnetic field and plasma properties clearly show 8−10 min variations across the vortex. The total magnetic field and density are enhanced in center of the vortex with a bipolar magnetic field perturbation in the field component normal to the magnetopause. Also the velocity is low in the center of the vortex and Vx and Vy components have an opposite polarity across the vortex. Magnetic reconnection favorably occurs in anti-parallel field region with slower shear velocity in the magnetosheath. The magnetic field lines are highly bent by parallel vorticity in the flanks of the magnetopause boundary. We suggest that the reconnection is a mechanism of generating vortex with a periodicity in the dayside during the southward IMF.