Japan Geoscience Union Meeting 2018

Presentation information

[EE] Oral

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

[P-EM16] Dynamics of Earth's Inner Magnetosphere and Initial Results from Arase

Tue. May 22, 2018 9:00 AM - 10:30 AM 303 (3F International Conference Hall, Makuhari Messe)

convener:Danny Summers(Memorial University of Newfoundland), Yoshizumi Miyoshi(Institute for Space-Earth Environmental Research, Nagoya University), Keisuke Hosokawa(電気通信大学大学院情報理工学研究科, 共同), Yusuke Ebihara(Research Institute for Sustainable Humanosphere, Kyoto University), Chairperson:Summers Danny

9:15 AM - 9:30 AM

[PEM16-20] Region-2 field-aligned current and ring current ions during storm main phase: Arase and AMPERE observations

*Shun Imajo1, Masahito Nose1, Ayako Matsuoka2, Satoshi Kasahara3, Shoichiro Yokota4, Mariko Teramoto6, Kunihiro Keika3, Brian Anderson5, Tetsuo Motoba5, Reiko Nomura7, Akiko Fujimoto8, Iku Shinohara2, Yoshizumi Miyoshi6 (1.Data Analysis Center for Geomagnetism and Space Magnetism, Graduate School of Science, Kyoto University, 2.Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency, 3.Graduate School of Science, The University of Tokyo, 4.Graduate School of Science, Osaka University, 5.The Johns Hopkins University Applied Physics Laboratory, 6.Institute for Space-Earth Environmental Research, Nagoya University, 7.Tsukuba Space Center, Japan Aerospace Exploration Agency, 8.International Center for Space Weather Science and Education, Kyushu University)

Keywords:magnetic storm, ring current, field-aligned current, magnetospheric-ionospheric coodinated observation

We present the first simultaneous in situ observation by the Arase satellite of the region-2 field-aligned currents (FACs) and the ring current during a storm main phase on 16 July 2017. The crossing of the postmidnight upward FAC with the maximum current density of 60 nA/m2 at L~4.2 and MLAT~20o was determined by a change in the azimuthal magnetic field. The peak of the FAC density was located in the inner part of the ring current derived from the plasma pressure. The current driven by the oxygen pressure significantly contributed to the ring current density, in particular in the inner part. The FAC density value and invariant latitude in the inner magnetosphere were consistent with the corresponding FAC on the ionosphere derived from the AMPERE (Active Magnetosphere and Planetary Electrodynamics Response Experiment), indicating a connection of FAC between these regions.