等离子体哨声波性质的实验研究  

Experimental Study on the Properties of Helicon Mode Whistler Waves

作　　者：唐磊 张乔枫 陆全明[1] 高新亮[1] 柯阳光 TANG Lei;ZHANG Qiaofeng;LU Quanming;GAO Xinliang;KE Yangguang(School of Earth and Space Sciences,University of Science and Technology of China,Hefei 230026)

机构地区：[1]中国科学技术大学地球和空间科学学院,合肥230026

出　　处：《空间科学学报》2024年第6期1006-1011,共6页Chinese Journal of Space Science

基　　金：国家重点研发计划项目资助(2022YFA1604600)。

摘　　要：哨声波是地球内磁层中常见的一种等离子体波动,其不仅可以加速电子到相对论能量,还可散射电子沉降到大气层形成弥散极光.哨声波是一支右旋偏振波,在空间等离子体中其等相位面通常被认为是一个平面.近年来,地面等离子体实验正在成为研究哨声波激发和传播的一种重要手段.本文在中国科学技术大学线性磁化等离子体装置(KLMP)上开展了磁环天线激发波动的实验,并利用3D磁探针测量了波动磁场的演化信息.测量结果发现,磁环天线激发了一种等相位面为螺旋状的右旋偏振波动,根据天线设置的不同,螺旋波模数分别为m=0和m=1.通过计算波动的波长和频率,确定这种螺旋波满足哨声波的色散关系,为进一步在等离子体实验装置中研究哨声波打下了基础.Whistler waves,as common plasma waves,play an important role in the Earth’s inner magne-tosphere.Through the interaction of whistler waves and particles,some electrons can be accelerated to relativistic energy,and another part of the electrons are scattered into the loss cone and settled into the atmosphere to form diffuse auroras.The whistler wave is a right-handed polarized wave whose equiphase plane is usually considered to be a plane in space plasma.In recent years,ground plasma experiments are becoming an important means to study the excitation and propagation of whistler waves.In the Keda Linear Magnetized Plasma device(KLMP)at the University of Science and Technology of China,a magnetic loop antenna is used to excite plasma waves and a 3D magnetic probe is used to measure the evolution of wave magnetic field.The measurement results show that the antenna has excited a right-handed polarization wave with a helical equiphase plane.The helicon waves modules are m=0 and m=1 according to different antenna settings.By calculating the wavelength and frequency of the waves,it is confirmed that the helicon waves can satisfy the dispersion relation of whistler waves,laying the founda-tion for further research on whistler waves in plasma experimental devices.

关 键 词：地面等离子体实验 哨声波 螺旋波 磁场测量 

分 类 号：P354[天文地球—空间物理学]