南极长城站电离层异常的模拟计算和分析

ANALYSIS OF THE IONOSPHERIC ANOMALY OVER GREAT WALL STATION,ANTARCTICA

本文采用现有模式，利用长城站电离层观测资料，模拟计算了Ｆ２层峰值高度及子午向热层风昼夜变化等。同时采用了热层风模式计算了长城站热层风的经验预测值。计算结果较好地解释了长城站的两个异常特征。夏季异常即ｆ０Ｆ２最大值出现在夜间。冬季特别是６、７月份临频显著减小。太阳辐射电离与热层中性风的竞相联合作用是导致夏季异常的关键。长城站地理上虽属高纬区，却处在地磁中纬区。

In this paper,we use an empirical method to derive the height of maximum electron concentration of the F 2 region and neutral meridional winds over Great Wall Station,Antarctic.Using the HWM 90 Model,the predictions of the meridional winds over Great Wall Station are also calculated. The results can explain two anomaly features of ionosonde data of GreatWall Station. In summer,peak values of f 0F 2 appear during night time. In winter,especially during June and July,f 0F 2 decrease dramatically compare to summer's data.Summer anomaly can be explained by combining effects of two competing cause,thermospheric winds and solar effects on ionosphere. The location of high geographic latitude and middle geomagnetic latitude of Great Wall Station is an important factor in this study.