中国东部地区电离层foF2在第22-23太阳活动周时空变化特性  

Temporal and spatial variation features of ionospheric foF2 in Eastern China during the 22-23 solar activity cycle

作　　者：蓝加平[1] 刘凯 朱正平[1] LAN Jiaping;LIU Kai;ZHU Zhengping(College of Electronics and Information Engineering,South-Central Minzu University,Wuhan 430074,China)

机构地区：[1]中南民族大学电子信息工程学院,武汉430074

出　　处：《中南民族大学学报（自然科学版）》2022年第2期186-193,共8页Journal of South-Central University for Nationalities：Natural Science Edition

基　　金：国家自然科学基金资助项目(41474135)。

摘　　要：利用我国覆盖高中纬到低纬5个台站第22-23太阳活动周(1995-2006)的foF2每日整点观测数据,分析研究了中国地区foF2的纬度变化、太阳活动变化、日变化、月变化、季节变化、半年变化、年变化和地磁活动变化等变化特性.结果表明:foF2随地理纬度变化,呈负相关关系,即纬度越低,其值越大;foF2与太阳活动F107有较强的正相关关系,太阳活动强度越大,foF2值也越大;foF2表现了较强的月变化和季节变化特征,结合日变化,在白天,foF2冬季大于夏季,表现出明显的“冬季异常”,在夜晚,夏季大于冬季,“冬季异常”现象没有出现;地磁活动受太阳活动影响,而foF2无明显的地磁活动依赖;foF2呈现明显的半年变化特征,与季节变化交叉相关,表现为“半年异常”,即两分点大于两至点.The variation features of foF2 in area of China with the longitude and latitude,the solar activity,day-to-day,the month,the season,the half a year,the year and the geomagnetic activity are analyzed and studied by using the daily hourly foF2 observation data in 5 stations of China for 12 years of 1995-2006 during the 22-23nd solar activity cycle.The following results were concluded.The foF2 in China changes with geographic latitude,showing a negative correlation,that is,the lower the latitude,the greater its value.The foF2 has a strong positive correlation with the solar activity index F107,the greater the solar activity intensity,the greater the value of foF2.The foF2 has strong monthly and seasonal changes and shows obvious“winter anomaly”during the daytime,that is,its value greater in winter than in summer,which does appear at night.The geomagnetic activity is affected by the solar activity,while the foF2 has no obvious dependence on geomagnetic activity.The foF2 presents obvious semi-annual change characteristics,and is crosscorrelated with seasonal changes,showing a“semi-annual anomaly”,that is,the foF2 in the spring equinox and the autumn equinox are greater than in the summer solstice and the winter solstice.

关 键 词：电离层 F2层临界频率 太阳活动周 

分 类 号：P352[天文地球—空间物理学]