学术讲座公告--- On the Generation of Banded Chorus

• 发布时间：[2023-07-05] 来源：[学院] 点击量：[5253]

报告时间：7月7日（周五）上午10点
报告地点：武汉大学电子信息学院五楼报告厅
报告题目：On the Generation of Banded Chorus
报告人：Kyungguk Min

报告主题简介：
       Whistler-mode chorus waves in the magnetosphere have been known since the dawn of space age. Chorus is best known for its rising (and sometimes falling) tones. It is generally agreed that the generation of such frequency chirps involves nonlinear physics involving phase bunching and trapping in an inhomogeneous magnetic field. Another well-known feature of chorus is a gap in intensity near half the electron gyro-frequency, fce/2, in which case it is called banded chorus. Although there have been many models proposed to explain this intriguing phenomenon, the origin of the intensity gap is still under active investigation. One model that is of interest here suggests that waves at fce/2 are selectively damped (as a result of cyclotron resonance) owing to a particular structure of electron distribution function, called the parallel plateau (which is essentially a relatively isotropic population in an intermediate energy range). The main part of the presentation will go through the development of this mechanism and how a new nonlinear process involving the parallel plateau may provide additional damping in excess of nonlinear wave growth.

报告人简介：
       Kyungguk Min earned his Ph.D. in Space Physics from New Jersey Institute of Technology in 2013. After two postdocs between 2013 and 2018, he moved to Chungnam National University in 2019 where he has since been serving as an assistant professor in the Department of Astronomy and Space Science. His main research interest is various plasma waves in the terrestrial magnetosphere and their role in the acceleration and depletion of radiation belt particles.

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