基于IGS的TEC赤道异常南-北不对称性分析

发布时间：2018-04-21 22:13

本文选题：电离层 + 赤道异常　；参考：《中山大学学报(自然科学版)》2013年04期

【摘要】：利用IGS提供的太阳活动第23-24周期间2000年1月1日至2011年12月31日的GPS TEC数据,分析了东南亚地区经度110°E区域在不同的太阳活动情况下白天电离层赤道异常(EIA)各参数的南-北不对称性变化,以及不对称性随太阳活动变化的关系。结果表明:太阳活动的强弱与赤道异常双峰强度和双峰差异大小的关系明显,赤道异常双峰在驼峰强度、纬度位置和出现的时间等都有明显的季节变化特征,且有比较明显的南-北不对称性。在太阳活动高时,EIA双峰强度差异明显比太阳活动低时要大,各季节的峰值强度均值表现为北驼峰比南驼峰强,6-8月份北驼峰峰值出现的时间平均比南驼峰出现时间晚约1 h。在太阳活动低时,夏季和秋季节时北驼峰比南驼峰强,秋冬季节南驼峰比北驼峰强,且冬季北驼峰出现的时间要比南驼峰早约1 h,在5-9月份期间北驼峰出现的时间要比南驼峰晚约2 h。随着太阳活动的逐渐升高,冬至期间不对称性指数Ia均值增大的趋势非常明显。
[Abstract]:Using the GPS TEC data from January 1, 2000 to December 31, 2011, provided by IGS for the solar activity cycle 23-24, The variation of the north-south asymmetry of the ionospheric equatorial anomaly (EIAA) parameters in the longitude 110 掳E region of Southeast Asia during the day under different solar activities and the relationship between the asymmetry and the solar activity are analyzed. The results show that the intensity of solar activity is obviously related to the bipeak intensity of the equatorial anomaly and the difference between the two peaks. The bipeaks of the equatorial anomaly have obvious seasonal variation characteristics in the intensity of the hump, the position of latitude and the time of appearance. And there is a more obvious north-south asymmetry. When the solar activity is high, the difference of EIA double peak intensity is obviously greater than that when the solar activity is lower. The average peak intensity of the north hump is higher than that of the south hump in June to August, and the average time of the north hump peak is about 1 hour later than that of the south hump in June and August. When the solar activity is low, the north hump is stronger than the south hump in summer and autumn season, and the south hump is stronger than the north hump in autumn and winter season. The time of northern hump appeared in winter was about 1 hour earlier than that of south hump, and that of north hump in May and September was about 2 hours later than that of south hump. With the increasing of solar activity, the average value of Ia increases obviously during the Winter Solstice period.
【作者单位】：广州气象卫星地面站;华南理工大学理学院;南京信息工程大学数学与统计学院;
【基金】：国家高技术研究发展(863)计划基金资助项目(2012AA121005)
【分类号】：P182.9

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