Ray-tracing simulations of whistler-mode wave propagation in different rescaled dipole magnetic fields  

作　　者：YangGuang Ke QuanMing Lu XinLiang Gao HuaYue Chen Rui Chen 

机构地区：[1]CAS Key Laboratory of Geoscience Environment,School of Earth and Space Sciences,University of Science and Technology of China,Hefei 230026,China [2]CAS Center for Excellence in Comparative Planetology,Hefei 230026,China [3]Collaborative Innovation Center of Astronautical Science and Technology,Harbin 150001,China

出　　处：《Earth and Planetary Physics》2022年第6期555-562,共8页地球与行星物理（英文版）

基　　金：supported by the National Natural Science Foundation of China (Grant No. 42104155);the China Postdoctoral Science Foundation (Grant No. 2021M693049);the Fundamental Research Funds for the Central Universities (Grant Nos. WK2080000150 and WK3420000013);the USTC (University of Science and Technology of China) Tang Scholar Program

摘　　要：Kinetic simulation is a powerful tool to study the excitation and propagation of whistler-mode waves in the Earth’s inner magnetosphere.This method typically applies a scaled-down dipole magnetic field to save computational time.However,it remains unknown whether whistler wave propagation in the scaled-down dipole field is consistent with that in the realistic dipole field.In this work,we develop a ray-tracing code with a scalable dipole magnetic field to address this concern.The simulation results show that parallel whistler waves at different frequencies gradually become oblique after leaving the equator and propagate in different raypaths in a dipole magnetic field.During their propagation,the higher frequency waves tend to have larger wave normal angles at the same latitude.Compared with the wave propagation in a realistic dipole field,the wave raypath and wave normal remain the same,whereas the wave amplification or attenuation is smaller because of the shorter propagation time in a scaled-down dipole field.Our study provides significant guidance for kinetic simulations of whistler-mode waves.

关 键 词：whistler wave ray tracing propagation dipole magnetic field MAGNETOSPHERE 

分 类 号：P353[天文地球—空间物理学]