Japan Geoscience Union Meeting 2023

Presentation information

[E] Oral

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

[P-EM13] Dynamics of the Inner Magnetospheric System

Tue. May 23, 2023 3:30 PM - 4:45 PM 101 (International Conference Hall, Makuhari Messe)

convener:Kunihiro Keika(Department of Earth and Planetary Science, Graduate School of Science, The University of Tokyo ), Yoshizumi Miyoshi(Institute for Space-Earth Environmental Research, Nagoya University), Theodore E Sarris(Democritus University of Thrace), Evan G Thomas(Dartmouth College), Chairperson:Satoko Nakamura(Institute for Space-Earth Environmental Research, Nagoya University), Shoya Matsuda(Kanazawa University), Kazuhiro Yamamoto(Graduate School of Science, The University of Tokyo), Yoshizumi Miyoshi(Institute for Space-Earth Environmental Research, Nagoya University), Kunihiro Keika(Department of Earth and Planetary Science, Graduate School of Science, The University of Tokyo)

3:45 PM - 4:10 PM

[PEM13-10] Simultaneous macroscale and microscale wave–ion interaction in near-earth space plasmas

★Invited Papers

*Qiugang Zong1 (1.Peking University)

Keywords:wave–ion interaction, EMIC waves, ULF waves

Identifying how energy transfer proceeds from macroscales down to micro-scales in collisionless plasmas is at the forefront of astrophysics and spacephysics. It provides information on the evolution of involved plasma systemsand the generation of high-energy particles in the universe. Here we report twocross-scale energy-transfer events observed by NASA’s Magnetospheric Mul-tiscale spacecraft in Earth’s magnetosphere. In these events, hot ions simul-taneously undergo interactions with macroscale (~105 km) ultra-low-frequencywaves and microscale ( ~ 103 km) electromagnetic-ion-cyclotron (EMIC) waves.The cross-scale interactions cause energy to directly transfer from macro-scales to microscales, and finally dissipate at microscales via EMIC-wave-induced ion energization. The direct measurements of the energy transfer ratein the second event confirm the efficiency of this cross-scale transfer process,whose timescale is estimated to be roughly ten EMIC-wave periods about(1 min). Therefore, these observations experimentally demonstrate thatsimultaneous macroscale and microscale wave-ion interactions provide anefficient mechanism for cross-scale energy transfer and plasma energization inastrophysical and space plasmas