摘要
基于一种电离层扰动提取方法一白谱法,利用IGS提供的电离层TEC网格数据,获得电离层J_s真指数、J_r指数和J_p指数,分别反映单站、纬度圈(沿经度积分)及行星际尺度下的电离层天气扰动状态.在2015年3月的一次磁暴过程中,J_s指数、J_r指数及J_p指数均很好地反映出电离层响应地磁暴的过程,磁暴前后J_p指数与Dst指数相关系数达到-0.72;J_s图从二维角度很好地表征了电离层天气的扰动过程.在此基础上,统计分析了2011—2014年J_p指数与Dst指数的相关性,结果表明:限定J_p≥2,J_P指数与对应时间Dst指数的相关系数为-0.67;限定J_p≥3,二者相关系数更高,达到-0.87.通过分析不同J_p指数阈值下不同等级磁暴的次数,发现J_p指数可以很好地反映磁暴下的电离层整体扰动,为指示电离层天气状态提供了可能的参数.
A Spectral Whitening Method（SWM） is introduced and applied in the study of ionospheric weather disturbances to calculate Js,Jr and Jp indices on the basis of Total Electron Content（TEC） data provided by IGS.These indices can reflect the disturbances of ionospheric weather of single station,latitude circle（integral along longitude） and the whole planet separately.During a geomagnetic storm in March 2015,all three indices well reflect the ionospheric disturbances.The correlation coefficient between Jp and Dst indices reaches-0.72,and the 2D images of ionospheric disturbances can be well captured by Js map.The correlation coefficient between Jp index and Dst index,from 2011 to 2014,reaches-0.67 if Jp is greater than or equal to 2,and the correlation coefficient can reach-0.87 if Jp is greater than or equal to 3.By analyzing the frequencies of different levels of geomagnetic storms under different threshold values of Jp index,the results suggest that Jp index,as a possible characterization parameter of ionospheric weather condition,can well reflect planetary ionospheric disturbances during geomagnetic storms.
出处
《空间科学学报》
CSCD
北大核心
2017年第3期270-276,共7页
Chinese Journal of Space Science
基金
国家高技术研究发展计划项目(2014AA123503)
国家自然科学重点基金项目(40931056
41404136)共同资助
关键词
电离层扰动
磁暴
白谱法
TEC
Ionospheric disturbance
Geomagnetic storm
SWM
TEC
作者简介
E—mail：wangjs@cma．gov．cn
