[P-EM13] Dynamics of the Inner Magnetospheric System

[PEM13-13] A study of EMIC wave property change using Arase satellite and ground-based magnetometer data

*Jaeyoung Kwak^1,2、Junga Hwang^1,2、Yukinaga Miyashita^1,2、Madeeha Talha^1,2、Yoshizumi Miyoshi³、Kazuo Shiokawa³、Chae-Woo Jun³ (1.Korea Astronomy and Space Science Institute、2.Department of Astronimy and Space Science, University of Science and Technology、3.Institute for Space-Earth Environmental Research, Nagoya University)

キーワード：magnetically conjugated EMIC events, Arase satellite and ground-based magnetometers, EMIC wave propagation

EMIC waves are generated near the plasmapause by various factors like solar wind dynamic pressure or energetic particle injection from the magnetotail. The EMIC waves play a key role in dispersing the energy accumulated in the magnetosphere as they propagate through magnetic field lines and ionospheric ducts. Because they can propagate even to low-latitude, in-situ detectors onboard magnetospheric satellites and ground-based magnetometers are able to detect EMIC wave and their property changes. This research focuses on analyzing magnetically conjugated EMIC wave events. We used MGF (Magnetic Field Experiment) instrument onboard Arase satellite and four different ground-based magnetometer data (MGD, MSR, STA, and BOH) which cover various L-value from L~1.22(STA) to L~2.89(MGD). The dataset spans from March 2017 to December 2023, which encompasses the entire available period of Arase satellite data. Visual inspections and an automatic wave detection algorithm were harnessed to detect EMIC wave events. By tracking EMIC waves from inception to extinction, changes in the wave characteristics and energy attenuation through propagation are elucidated.

This research was supported by Young Scientist+ Research Program 2023 through the Korea National University of Science and Technology. (No. 2023YS19)