摘要
利用1999～2009年的IGS电离层电子浓度总含量（TEC）数据,分析全球TEC白天值Idc和夜间值Inc的半年变化、季节变化特性,并研究二者跟太阳、地磁活动的关系。结果表明,Idc最大值出现在春秋分季节是一个非常普遍的现象。除了北半球近极地地区和南半球的南美洲地区外,Idc的半年变化特性都很明显;Inc只在低纬度地区具有半年变化特性,并且Idc和Inc半年变化特性随太阳活动变化而变化,在太阳活动高年,全球85%以上地区Idc最大值出现在春秋分季节;Idc和Inc的季节变化特性随经纬度变化,并且在太阳活动高年季节变化明显;在一个太阳活动周期上Idc、Inc与太阳活动P指数日均值的相关性较强,相关系数达到0.9,但与地磁活动Dst、Kp、Ap指数日均值的相关性较弱,相关系数小于0.4。本文进一步展示了太阳天顶角控制的电离层光化学产生率对电离层TEC整体变化特征起主要作用。
Based on 1999～2009 total electron content（TEC）data from IGS,we studied semiannual and seasonal variations of the global TEC in the daytime（Idc）and nighttime（Inc）as well as solar and geomagnetic effects on these variations.The main features are outlined as follows：the maximum values of Idccommonly appear in equinox seasons;in the northern‘near-pole＇region and south America,the semiannual variation character of Idcis significant.Inc has only semiannual variation at low latitudes,and the semiannual variation of Idcand Incchange with the solar activity.At high solar activity years,in more than 85% area of the globe,the maximum value of Idcappears in equinox seasons.Seasonal variation of Idcand Incchange with latitude and longitude,and seasonal variation is apparent at high solar activity years.The variation of Idcand Inccorrelates well with the solar Pindex,where the correlation coefficient reached 0.9.However,it poorly correlated with geomagnetic Dst,Kp,Apindex,where the correlation coefficient is less than 0.4.We further demonstrate that ionosphere photochemical production rate,which is controlled by solar zenith angle,plays a major role in the overall variation of TEC.
出处
《大地测量与地球动力学》
CSCD
北大核心
2015年第2期293-297,共5页
Journal of Geodesy and Geodynamics
关键词
IGS
TEC
半年变化
季节异常
相关性分析
IGS
TEC
semiannual variation
seasonal variation
correlation analysis
