两种用于实验模拟空间等离子体漂移速度剪切的方法  

Sheared E×B flow encountered in space plasma excited from two controllable methods

作　　者：黄可昕 张逍 金融 刘宇[1,2] 雷久侯[1,2] Kexin Huang;Xiao Zhang;Rong Jin;Yu Liu;Jiuhou Lei(CAS Key Laboratory of Geospace Environment,School of Earth and Space Sciences,University of Science and Technology of China,Hefei 230026,China;CAS Center for Excellence in Comparative Planetology,Hefei 230026,China)

机构地区：[1]中国科学技术大学地球与空间科学学院中科院近地空间环境重点实验室,安徽合肥230026 [2]中国科学院比较行星学卓越创新中心,安徽合肥230026

出　　处：《中国科学技术大学学报》2022年第2期35-41,67,共8页JUSTC

基　　金：the USTC Research Funds of the Double First-Class Initiative(YD3420002002);the Youth Innovation Promotion Association CAS(2020451);Fundamental Research Funds for the Central Universities(WK3420000011).

摘　　要：E×B漂移速度剪切广泛存在于日地空间等离子体,是一种重要的不稳定性自由能来源。相对于空间被动观测,在地面等离子体实验中主动激发E×B漂移速度剪切有助于对相关不稳定过程的研究。我们设计并测试了两种主动激发E×B漂移速度剪切的方法:双等离子体叠加法和环电极法。初步结果表明,两种方法可以提供不同强度和空间尺度的E×B漂移速度剪切,并可以满足后续有关电离层不均匀体研究以及等离子体过程研究等空间等离子体地面实验的需求。Sheared E×B flow has been frequently observed to excite instability in space plasma.In this study,two methods–the interpenetrating plasma and ring electrode methods–were developed in the Keda Space Plasma EXperi-ment(KSPEX)device to trigger sheared E×B flow.Both methods produce sheared E×B flow by generating a radial electric field.The results of the experiment indicated that plasma instabilities in the ion cyclotron range can be excited by these methods.Therefore,the methods reported here are important for research on the mechanism for generating sheared flow-driven plasma instabilities,which may enrich our understanding of geospace physics.

关 键 词：速度剪切 径向电场 偏压电极 电离层不均匀体 

分 类 号：P354.4[天文地球—空间物理学] O534[天文地球—地球物理学]