暴时极光区热层大气焦耳加热与F区电离耗空的EISCAT雷达观测

利用EISCAT雷达探测数据，分析计算了太阳活动高年夏季发生的一次强磁暴（最小Dst=-150nT）期间，极光区电离层对流电场、电导率以及焦耳加热速率等参量．着重考察了E区热层大气焦耳加热和F区离子摩擦增温与F区电子密度耗空的关系．发现在下午东向极光电集流期间，电子密度最大耗空出现在F区300—325km高度，时间恰在积分的E区大气焦耳加热最大值（92mW／m2）和F区最大离子增温之后5—10min，耗空率达70％．

Nonlinear Dust Acoustic Waves in Dissipative Space Dusty Plasmas with Superthermal Electrons and Nonextensive Ions

The nonlinear characteristics of the dust acoustic(DA)waves are studied in a homogeneous,collisionless,unmagnetized,and dissipative dusty plasma composed of negatively charged dusty grains,superthermal electrons,and nonextensive ions.Sagdeev pseudopotential technique has been employed to study the large amplitude DA waves.It(Sagdeev pseudopotential)has an evidence for the existence of compressive and rarefractive solitons.The global features of the phase portrait are investigated to understand the possible types of solutions of the Sagdeev form.On the other hand,the reductive perturbation technique has been used to study small amplitude DA waves and yields the Korteweg-de Vries-Burgers(Kd V-Burgers)equation that exhibits both soliton and shock waves.The behavior of the obtained results of both large and small amplitude is investigated graphically in terms of the plasma parameters like dust kinematic viscosity,superthermal and nonextensive parameters.