[P-EM13] Dynamics of the Inner Magnetospheric System

[PEM13-05] Nonlinear Landau resonance between energetic electrons and whistler-mode waves: ELFIN and ERG observations

★Invited Papers

*Xiaojia Zhang¹, Anton Artemyev², Satoshi Kasahara³, Vassilis Angelopoulos², Shoichiro Yokota⁴, Tomoaki Hori⁵, Kunihiro Keika³ (1.Department of Physics, The University of Texas at Dallas, Richardson, TX, USA, 2.Department of Earth, Planetary, and Space Sciences, University of California, Los Angeles, USA, 3.Department of Earth and Planetary Science, School of Science, The University of Tokyo, Tokyo, Japan, 4.Department of Earth and Space Science, Graduate School of Science, Osaka University, Toyonaka, Japan, 5.Institute for Space Earth Environmental Research, Nagoya University, Nagoya, Japan)

Keywords:Nonlinear wave-particle interaction, Whistler-mode waves, Landau resonance, ELFIN, ERG

Electromagnetic whistler-mode waves are the main wave mode resonating with energetic electrons in the Earth’s radiation belts. Such resonant interactions can result in electron acceleration and precipitation to the Earth’s atmosphere. The most effective regime of resonant interaction is the nonlinear one, which involves effects of phase trapping and bunching. This presentation is devoted to observational evidences of such nonlinear resonant interactions between 10-100keV electrons and very oblique whistler-mode waves. Nonlinear Landau resonance with these oblique whistler waves may produce sub-relativistic electron microbursts and shape field-aligned electron distributions near the equator. Combining numerical simulations and observations from low-altitude ELFIN CubeSats and near-equatorial ERG satellite, we will demonstrate the efficiency of nonlinear Landau resonance in electron acceleration, formation of field-aligned electron populations and electron losses.