第23太阳活动周热层大气密度对太阳辐射指数F_(10.7)响应的模拟研究  

TIEGCM Numerical Study on the Thermospheric Density Response to Solar F_(10.7) Radio Flux Variations during the 23rd Solar Cycle

作　　者：唐成 李嘉巍[2] 张效信[2] 王文斌 于超[1,2] TANG Cheng;LI Jiawei;ZHANG Xiaoxin;WANG Wenbin;YU Chao(School of Mathematics and Statistics,Nanjing University of Information Science and Technology,Nanjing 210044;Key Laboratory of Space Weather,National Center for Space Weather,China Meteorological Administration,Beijing 100081;High Altitude Observatory,National Center for Atmospheric Research,Boulder Colorado 80307)

机构地区：[1]南京信息工程大学数学与统计学院,南京210044 [2]国家空间天气监测预警中心,中国气象局空间天气重点开放实验室,北京100081 [3]High Altitude Observatory,National Center for Atmospheric Research,Boulder Colorado 80307

出　　处：《空间科学学报》2021年第5期704-714,共11页Chinese Journal of Space Science

基　　金：国家自然科学基金项目(41931073,41774152);中国科学院空间科学战略性先导科技专项(XDA15350203)共同资助。

摘　　要：利用NCAR-TIEGCM计算了第23太阳活动周期间(1996—2008年)400km高度上的大气密度,并统计分析大气密度对太阳辐射指数F_(10.7)的响应.结果表明,在第23太阳活动周内,大气密度的变化趋势与太阳辐射指数F_(10.7)的变化趋势基本一致,但是大气密度在不同年份、不同月份对太阳辐射指数F_(10.7)的响应存在差异.第23太阳活动周内太阳辐射极大值和极小值之比大于4,而大气密度的极大值与极小值之比则大于10.太阳辐射低年的年内大气密度变化不到2倍,而太阳辐射高年的年内大气密度变化可达2倍甚至3倍.大气密度与F_(10.7)指数在北半球高纬的相关系数比南半球高纬的相关系数大.在低纬地区,太阳辐射高年大气密度与F_(10.7)指数的相关系数比低年的大.不同纬度上,大气密度与太阳辐射指数F_(10.7)的27天变化值之间的相关系数都大于其与81天变化值之间的相关系数.Thermospheric densities at the altitude of 400km during the 23rd solar cycle(1996—2008)are calculated using the NCAR-TIEGCM.The modeled responses of thermospheric density to solar radiation index F_(10.7) variations are statistically analyzed.The results show that during the 23rd solar cycle,the variations of thermospheric density are basically consistent with those of F_(10.7).However,the responses of thermospheric density to changes in F_(10.7) are different in different years and months.The increase of solar radiation from solar minimum to maximum is more than a factor of 4 in the 23rd solar cycle,and the increase of thermospheric density from solar minimum to maximum is more than a factor of 10 during the same interval.The intra-annual density variations in the solar minimum years are less than a factor of 2 between density minimum and maximum,whereas those in the high solar activity years can be greater than a factor of 2 or even 3.The correlation coefficients between the thermospheric mass density and the F_(10.7) index in the middle and high latitudes of the Northern Hemisphere are larger than those in the middle and high latitudes of the Southern Hemisphere,exhibiting an evident norther-south asymmetry.In the low latitudes,the correlation coefficients between the thermospheric mass density and the F_(10.7) index in high solar activity years are larger than those in solar minimum years.At different latitudes,the correlation coefficient between the thermospheric density and the 27-day variation of F_(10.7) is greater than that between the 81-day variations of thermospheric density and F_(10.7).

关 键 词：热层大气密度 太阳辐射指数F_(10.7) TIEGCM 统计分析 

分 类 号：P353[天文地球—空间物理学]