行星际磁场扰动下极区热层中性风对夜侧离子拖曳的响应

离子拖曳可以对极区的高层大气中性风场产生强烈影响。行星际磁场(interplanetary magnetic field,IMF)扰动期间,通过全天空法布里-帕罗干涉仪(all-sky Fabry-Perot interferometer,all-sky FPI)的观测数据,分析了2012年1月21日21:21UT~2012年1月22日00:11 UT期间北极黄河站(78.92°N,11.93°E)上空630.0 nm氧原子辐射高度的中性风视线风场。行星际扰动数据与同时期离子风数据的对比分析表明,行星际磁场扰动使得Super DARN监测到的F层夜侧离子运动加速,高速运动的离子与中性风发生耦合,离子以传送动力给中性大气并向其运动方向拖曳的方式改变中性风的风场形态。

Response of polar thermosphere neutral wind to the night side ion drag during IMF disturbance

In the polar region upper atmosphere,neutral wind is affected by the ion drag force strongly.During the disturbance,we select the data observed by all-sky FPI and study the response of polar high latitude neutral wind to ion drift,by analyzing the neutral atmosphere horizontal wind field at 630.0nm oxygen atom layer.The wind field from 21:21UT on January 21 to 00:11UT on January 22 in 2012 have been analyzed.The analysis that IMF data contrasts with the ion wind at the same time indicates the night side ion at F layer monitored by SuperDARN is accelerated by the IMF disturbance. High speed ions couple with neutral wind. The neutral wind form is changed by ion movement in ways of power transmission and drag force from its direction.