Japan Geoscience Union Meeting 2024

Presentation information

Print

[E] Oral

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

[P-EM10] Dynamics of Magnetosphere and Ionosphere

Mon. May 27, 2024 9:00 AM - 10:15 AM Exhibition Hall Special Setting (2) (Exhibition Hall 6, Makuhari Messe)

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

9:15 AM - 9:30 AM

[PEM10-02] Circulation and acceleration of ionosphere outflow O+ ions through upstream solar wind region driven by an IMF discontinuity: 3D global hybrid simulation

*Chih-Ping Wang1, Xueyi Wang2, Yu Lin2 (1.University of California Los Angeles, 2.Auburn University)

Keywords:ionosphere outflow, O+ ions, IMF discontinuity, ring current, circulation and acceleration

Based on the predictions of global 3D hybrid simulations, we present a new transport/acceleration path for escaped ionosphere outflow O+ ions in the upstream solar wind region resulting from the impact of a particular IMF tangential discontinuity (TD) with negative (positive) IMF Bz on the discontinuity’s anti-sunward (sunward) side. For O+ ions escaping to the duskside magnetosheath and with gyro-radii larger than the TD thickness, when they encounter the TD, they can first go sunward into the upstream solar wind. They then gyrate clockwise to the pre-noon side and get accelerated within the solar wind region and circulate back to the dawnside magnetosphere. These ions may be accelerated to well within the ring current energy range (~30 to 100s of keV) depending on the solar wind electric field strength. This new transport/acceleration path can bring some of the escaped ions into the inner magnetosphere, thus providing a new mechanism for generating an O+ ring current population.