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 1:45 PM - 3:15 PM 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:Ebihara Yusuke(RISH, Kyoto University)

2:45 PM - 3:00 PM

[PEM16-35] Stationary wave condition of oblique whistler mode waves regarding Landau resonance

*Yikai HSIEH1, Yoshiharu Omura1 (1.Reserach Institute for Sustainable Humanosphere, Kyoto University)

Keywords:oblique whistler mode wave, Landau resonance, relativistic electron, wave-particle interaction

Landau resonance appears in oblique whistler mode wave-particle interactions but not in parallel whistler mode wave ones. The electrostatic component of wave field triggers the trapping of electrons through Landau resonance. The resonance velocity of the Landau resonance becomes very close to the parallel group velocity of nearly parallel whistler mode waves at a certain frequency as functions of wave normal angles. Inside the wave packet, the trapped electrons move together with the wave group velocity along the magnetic field line and see a static amplitude and a phase of the wave. Thus, the condition is named stationary wave condition. Wave-particle interactions under this condition. We figure out the relationship between stationary wave condition and Gendrin angle of oblique waves. Wave-particle interactions under the stationary wave condition are revealed in this study by test particle simulations. We found that the trapped electrons undergoing the Landau resonance are accelerated efficiently. The energy gain of electrons undergoing the condition is higher than that of other electrons.