中低纬等离子体泡的非线性数值模拟  

Nonlinear numerical simulation of plasma bubble in low and mid-latitudes

作　　者：佘承莉[1] 於晓[1] 罗伟华[2] 冯健[1] 甄卫民[1] 

机构地区：[1]中国电波传播研究所,山东青岛266107 [2]武汉大学电子信息学院,湖北武汉430079

出　　处：《电波科学学报》2010年第6期1140-1145,共6页Chinese Journal of Radio Science

基　　金：国防科技重点实验室资助项目(9140C0801030802;9140C0801030903)

摘　　要：在一维密度扰动的假定下,考虑不同的初始背景电场条件,对太阳高年的春季期间的赤道以及中低纬地区电离层F区的等离子体不稳定性进行了非线性数值模拟研究。结果表明:在没有背景电场作用时,只有磁赤道地区的密度扰动能发展成等离子体泡,并上升到F层峰以上;中低纬地区的密度扰动需要在背景电场的作用下才能进一步发展成等离子体泡;随着纬度增大,等离子体不稳定性发展所需要的背景电场越强,这意味着导致磁赤道和中低纬地区的等离子体泡形成的等离子体不稳定性不同。In the presence of one dimension electron density disturbance,the model results of nonlinear evolution of the plasma instabilities are presented for ionospheric F region in equator and the low and mid-latitudes,according to different background electric fields conditions during high solar activity spring periods.We found that with the absence of electric field,the density disturbance can evolve into plasma bubbles only in equatorial region which rise beyond the height of maximal electron density in F layer,while eastward electric field is necessary for bubble evolution at low and mid-latitudes.The fact that the necessary eastward electric field tends to become larger for the higher latitudes indicts that,the predominant plasma instabilities mechanisms are different between the equatorial and the low and mid-latitudinal ionosphere.

关 键 词：不稳定性 非线性数值模拟 等离子体泡 

分 类 号：P352[天文地球—空间物理学]