摘要
利用福州台站(26.1°N,119.3°E,磁纬14.4°N)电离层闪烁与TEC监测仪2006—2010年的观测数据,对该地区垂直总电子含量(VTEC)进行时间变化特性分析.结果表明,春秋冬三季的VTEC平均最高值出现在06:00 UT,夏季出现在08:00 UT,所有季节的平均最低值均出现在21:00 UT;VTEC变化存在季节异常和弱冬季异常,春秋季节高,冬夏季节低,夏季VTEC比冬季低且最大值出现时间延迟;VTEC在2006—2009年呈现下降的变化趋势,2010年开始增强,年际变化与太阳活动及地磁活动变化趋势具有较好的对应关系;VTEC变化与太阳活动存在很好的相关性,相关系数达到0.5以上,地磁活动则显示了弱相关的特性;F_(10.7)与VTEC的相关性随着每天Kp指数总值∑K_p的增大而减小.
Observational data obtained (26.1°N, 119.3°E, geomagnetic latitude by an ionospheric scintillation and TEC monitor at Fuzhou 14.4°N) during 2006--2010 is used to analyze the charac- teristic of temporal variation of vertical TEC in this region. The results show that the maximum value occurs at 06:00 UT during spring, autumn and winter while at 08:00 UT during summer, and the averaged minimum occurs at 21:00UT for all seasons. A seasonal anomaly of VTEC is found with the high value occurring during spring and autumn seasons while low value during summer and winter seasons; there is a weak winter anomaly of VTEC. The value in summer are relatively lower than that in winter and the occurrence time of maximum is delayed. VTEC reveals a decreasing tendency from 2006 to 2009 and increases during 2010, which is corresponding with the yearly varia- tion of solar and geomagnetic activity. The correlation analysis exhibits that the variation of VTEC has a good relation with solar activities with a value of over 0.5, while it shows a weak relationship with the geomagnetic activity. Correlation between F10.7 and VTEC decreases with the raise of total value of geomagnetic index Kp (∑Kp).
出处
《空间科学学报》
CAS
CSCD
北大核心
2013年第3期270-276,共7页
Chinese Journal of Space Science
基金
国家重点基础研究发展计划项目资助(2012CB825606
2011CB811406)
关键词
低纬地区赤道电离层异常
垂直TEC
季节变化
Low latitude region, Equatorial ionospheric anomaly, Vertical TEC, Seasonal variation