Japan Geoscience Union Meeting 2022

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[E] Poster

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

[P-EM11] Dynamics of the Inner Magnetospheric System

Wed. Jun 1, 2022 11:00 AM - 1:00 PM Online Poster Zoom Room (3) (Ch.03)

convener:Kunihiro Keika(Department of Earth and Planetary Science, Graduate School of Science, The University of Tokyo ), convener:Yoshizumi Miyoshi(Institute for Space-Earth Environmental Research, Nagoya University), Lauren W Blum(University of Colorado Boulder), convener:Yuri Shprits(Helmholtz Centre Potsdam GFZ German Research Centre for Geosciences), Chairperson:Kunihiro Keika(Department of Earth and Planetary Science, Graduate School of Science, The University of Tokyo)


11:00 AM - 1:00 PM

[PEM11-P17] Electron hybrid code simulation of the whistler-mode chorus generation based on the RAM/SCB results of the March 2017 storm

*Yuto Katoh1, Yoshizumi Miyoshi2, Vania Jordanova3, Satoshi Kurita4, Shoya Matsuda5, Shinji Saito6 (1.Department of Geophysics, Graduate School of Science, Tohoku University, 2.ISEE, Nagoya University, 3.Los Alamos National Laboratory, 4.RISH, Kyoto University, 5.College of Science and Engineering, Kanazawa University, 6.National Institute of Information and Communications Technology)

Keywords:inner magnetosphere, whistler-mode chorus, energetic electrons, numerical simulation

We carry out a series of self-consistent electron hybrid code simulations (Katoh and Omura, 2007; Katoh et al., 2018) for the whistler-mode chorus generation in the inner magnetosphere, based on results of ring current-atmosphere interactions model with self-consistent magnetic field (RAM-SCB; Jordanova et al., 2012) for the March 2017 storm. Rising tone chorus emissions were observed by the Arase satellite during the storm in the morning side of the magnetosphere at L=6. RAM-SCB results provide the evolution of the distribution function of energetic electrons during the storm. The electron hybrid code simulation enables us to study the condition required for the chorus generation, governed by fully nonlinear processes of wave-particle interactions. We select a snapshot of the RAM-SCB result at the timing when the enhancement of whistler-mode chorus emissions is expected. The bi-Maxwellian type velocity distribution function, Nh*f(v||, v⊥), is constructed from the RAM-SCB result, where Nh is the number density of energetic electrons, f is the probability distribution function in the velocity space, and v|| and v⊥ are the velocity components parallel and perpendicular to the background magnetic field, respectively. We use f(v||, v⊥) for the electron hybrid code simulation's initial condition and conduct a survey for Nh required to generate rising tone chorus. By comparing Nh determined from the survey and those obtained by the RAM-SCB simulations, we discuss the property of the chorus generation during the storm time.