北京地区电离层Chapman标高的统计分析  

Statistical analysis of the ionospheric Chapman scale height at Beijing

作　　者：解海永[1,2] 宁百齐[1,2] 刘立波[1,2] 余涛[3] 胡连欢[1,2] 吴宝元[1,2] 郑建昌[1,2] 常首民 

机构地区：[1]中国科学院地质与地球物理研究所,北京空间环境国家野外科学观测研究站,北京100029 [2]中国科学院地质与地球物理研究所,中国科学院行星与地球物理重点实验室,北京100029 [3]国家空间天气监测预警中心,北京100081

出　　处：《地球物理学报》2014年第11期3523-3531,共9页Chinese Journal of Geophysics

基　　金：国家自然科学基金项目(41127003,41374164,41204113,41104106);科技基础性工作专项(2008FY120100)资助

摘　　要：利用F2层峰值处的Chapman标高Hm可以构建电离层顶部的电子浓度剖面.本文通过对北京站(40.3°N,116.2°E)从2010年1月到2014年5月的电离层频高图人工度量后获得了F2层峰值处的Chapman标高Hm,分析研究了Hm随周日、季节和太阳活动变化,并探讨了Hm与F2层特征参数foF2、hmF2以及IRI底部厚度参数B0的相关性.研究表明,(1)北京地区标高Hm的周日变化明显,在正午左右有最大值,夏季和春秋季的最小值出现在午夜左右,而冬季有两个谷值,在日出后和20∶00LT左右;Hm在日出前有较小的增加,但不是很明显;(2)白天标高Hm有明显的季节变化,夏季最强,冬季最弱,而夜间的季节变化较小;(3)Hm随太阳活动的增强而增大,地磁扰动会引起Hm偏离正常水平;(4)Hm与hmF2相关性很弱,但白天和夜间各自的相关性较强,并且夜间大于白天;Hm与B0有很强的相关性;(5)由IRI2012给出的B0与Hm在冬季的相关性很小,表明IRI模式还需要进一步改进.The Chapman scale height around F2 peak （Hm） can be used to extrapolate the topside electron density profile. In this paper, plenty of manual work has been done to scale the ionograms recorded at Beijing （40.3°N, 116.2°E） during the period from January 2010 to May 2014, and the scale height Hm around F2 peak is deduced. The diurnal, seasonal and solar activity variations of Hm are statistically analyzed, and the correlations between Hm and the F2 peak parameters foF2, hmF2 and the IRI bottomside thickness parameter B0 are also discussed. The present study showed that. （1） Hm has an obvious diurnal variation with the peak occurring around noontime and the valley occurring at midnight. For winter seasons, the diurnal variationhas two valleys with one after sunrise and the other at about 20：00LT. Sm has an increase before sunrise, but it is not distinct. （2） Hm during daytime shows a clear seasonal variation with the maximum in summer and minimum in winter, while exhibits a much weaker seasonal variation at night. （3） Sm increases with increasing solar activity, and significantly deviates from normal behavior during geomagnetic disturbance. （4） The correlation between Hm and hmF2 is very weak, while they have a moderate correlation during nighttime and daytime respectively, and the former is stronger than the latter. Hm is strongly correlated with thickness parameter B0. （5） The small correlation between Hm and B0 from IRI2012 in winter indicates that the IRI model needs further improvement.

关 键 词：频高图 电子浓度剖面 标高 IRI 

分 类 号：P352[天文地球—空间物理学]