电磁波在磁化非均匀等离子体中传播的O-X模式转换  

O-X Mode Conversion of Electroncyclotron Wave in Magnetizednon-uniform Plasma

作　　者：熊一玉 唐昌建[1] Yiyu Xiong;Changjian Tang(Key Laboratory of High Energy Density Physics and Technology Ministry of Education,Sichuan University,Chengdu 610065,China)

机构地区：[1]四川大学,高能量密度物理及技术教育部重点实验室,成都610065

出　　处：《电气工程与自动化（中英文版）》2024年第1期1-4,共4页Electrical Engineering and Automation

摘　　要：研究了电磁波在磁化非均匀等离子体传播过程中的寻常模(O模)与非寻常模(X模)的转换机制和传播特征。研究表明,导致O模与X模发生转化的根本原因是,电磁波的O模与X模的电场极化不断随等离子体密度、磁场以及波与磁场夹角的变化而变化,从而导致O模在接近截止层的区域可以完全蜕变为X模的电场极化特征,发生所谓O-X模式转换。此外,在不均匀等离子体中电磁波的O-X模式转化是一渐变过程,且在截止层以后电磁波仍能够以X模传播。因此,等离子体对电磁波具有屏蔽作用并不是普适的。This study investigates the conversion mechanism and propagation characteristic of ordinary mode and extraordinary mode when electron cyclotron wave propagates in plasma.The result shows that the fundamental reason for the conversion of O mode and X mode is that the electric field polarization of the O mode and X mode of electromagnetic waves constantly changes with changes in plasma density,magnetic field,and the angle between the wave and magnetic field.This leads to the complete transformation of the O mode into the electric field polarization characteristics of the X mode near the cutoff layer,resulting in the so-called O-X mode conversion.In addition,the O-X mode conversion of electromagnetic waves in non-uniform plasmas is a gradual process,and electromagnetic waves can still propagate in X-mode after the cutoff layer.Therefore,the shielding effect of plasma on electromagnetic waves is not universal.

关 键 词：电磁波 模式转换 等离子体 

分 类 号：G63[文化科学—教育学]