低太阳活动期间极区热层子午风季节变化特征分析——EISCAT雷达观测与HWM07模型比较  

Analysis of Characteristics of Seasonal Variations of Polar Thermospheric Meridional Wind during Solar Minimum: Comparison of Measurements of EISCAT Radar and HWM07 Predictions

作　　者：占卫家 蔡红涛[2] ZHAN Wei-jia;CAI Hong-tao(The School of Natural Sciences and Mathematics,The University of Texas at Dallas,Richardson 75080,USA;Electronic Information School,Wuhan University,Wuhan 430072,China)

机构地区：[1]德克萨斯大学达拉斯分校自然科学与数学学院,理查德森75080 [2]武汉大学电子信息学院,武汉430072

出　　处：《科学技术与工程》2019年第17期25-31,共7页Science Technology and Engineering

基　　金：国家自然科学基金(41374159,41431073,41574148)资助

摘　　要：利用2008~2011年间EISCAT(european incoherent SCATter)雷达场向观测数据计算低F层子午风,分析比较了其季节变化特征。统计结果表明:低太阳活动期间,白天的极向子午风在冬季最强,在夏季最弱;白天极向子午风在夏季的持续时间最短;夜晚的赤道向子午风在春季最大。对比发现HWM07(horizontal wind model 07)模式在低太阳活动期间基本上能够较好重现低F层中性子午风的日变化特征,预测结果和雷达观测都表现出明显的日变化特征,即白天出现极向子午风夜晚,出现赤道向子午风。具体地比较发现,模式的预测结果在春夏季与雷达结果相差较大,而在秋冬季比较一致。This issue is focused on statistically analyzing the seasonal variations of polar thermospheirc meridional winds in lower F layer by calculating meridional winds through line-of-sight measurements of EISCAT (european incoherent SCATter) radar during 2008 and 2011.The main features are that the pole-ward meridional winds during daytime flow the strongest in winter and the weakest in summer and the duration of pole-ward wind in summer is also the shortest.The equatorward winds at night flow the strongest in spring.Through comparison with predictions of HWM07 (horizontal wind model 07),the winds obtained from EISCAT radar and HWM07 show an obvious diurnal variation that meridional wind flows pole-ward during daytime and equatorward at night.The agreement between model predictions and radar measurements is good in autumn and winter,but in spring and summer especially in summer,there exists an obvious difference.

关 键 词：子午风 季节变化 太阳活动低年 EISCAT HWM07 

分 类 号：P352[天文地球—空间物理学]