电子耗空对喷焰尘埃等离子体离子波不稳定性的影响  

The influence of electron depletion to exhaust dusty plasma ion wave instability

作　　者：马征征[1] 许正文[1] 徐彬[1] 吴健[1] 

机构地区：[1]中国电波传播研究所电波环境特性及模化技术重点实验室,青岛266107

出　　处：《电波科学学报》2016年第6期1087-1092,共6页Chinese Journal of Radio Science

基　　金：国家自然科学基金(No.11672068;41104102;61601419)

摘　　要：在离子波不稳定性增长率的计算过程中增加对自洽尘埃电荷数的考虑,以考察电子耗空效应对尘埃等离子体离子波不稳定性增长率的影响.通过比对多个算例的计算结果发现:随着尘埃数密度的增大,电子耗空的加剧可以导致不稳定性增长率减小;喷焰释放早期的离子波不稳定性增长率可以更低;无论是尘埃数密度还是中性分子数密度单独增大,均可以导致离子波不稳定性增长率的减小.这表明现有理论方法中隐含的假设不是恒成立.We considered the self-consistent dust charge number in calculating ion wave instability growth rate,in order to survey the influence of electron depletion effect to dusty plasma ion wave instability growth rate.By comparing calculation results of several cases,we found that as the dust number density increases,electron depletion intensification could lead to the decrease of instability growth rate,and that the ion wave instability growth rate could be lower on the early stage of the released exhaust.The number density increase of either dust or neutral molecule can lead to the decrease of ion wave instability growth rate.This indicates that the assumption in present theory is not always correct.

关 键 词：电子耗空 喷焰 尘埃等离子体 离子波 不稳定性 

分 类 号：P354[天文地球—空间物理学]