黄河站低热层中性风对极光亚暴的响应

RESPONSE OF LOWER THERMOSPHERIC NEUTRAL WIND AT YELLOW RIVER STATION IN ARCTIC TO AURORAL SUBSTORM

为了研究极光亚暴期间低热层中性风的行为,使用2017年1月25日—2017年1月27日UT北极黄河站(北纬78°55′、东经11°56′)的全天空法布里-珀罗干涉仪(Fabry-Perot interferometer, FPI)OI 557 nm干涉环图像,反演出水平风场和垂直风场,结合地磁Kp、AE指数以及离子风速,研究了亚暴期间影响低热层风场的因素。结果表明:地磁活动与低热层中性风具有相关性。本次观测的事件中,地磁平静期水平风均值50m·s^(-1),垂直风均值3m·s^(-1),地磁活跃期水平风均值80m·s^(-1),离子拖拽和焦耳加热增强中性风的运动,强地磁活动会引发垂直风风切变现象,离子拖拽主导中性风的运动。

To study the behavior of thermospheric neutral wind during the auroral substorm,we used the OI 557 nm interference fringe images measured by all-sky Fabry-Perot interferometer(FPI)during January 25th,2017 to January 27th,2017 at Yellow River Station in Arctic to get the horizontal and vertical wind,considering the geomagnetic Kp,AE index and the ion drift velocity,the factor was studied that affected the thermospheric neutral wind during the substorm.The results show that the geomagnetic activity is correlated with the neutral wind in the lower thermosphere.In this observed event,the mean value of horizontal wind is 50 m·s^-1 and that of vertical wind is 3 m·s^-1 during the geomagnetic calm period.In the geomagnetic active period,the horizontal wind mean 80 m·s^-1 ion drag and Joule heating promote the neutral wind movement,the strong geomagnetic activity leads to the vertical wind shear phenomenon,and the ion dragging dominates the neutral wind movement.