| 2017年9月磁暴期间电离层TEC变化分析 |
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| 引用本文： | 李涌涛,李建文,庞鹏,刘德智,李婧.2017年9月磁暴期间电离层TEC变化分析[J].全球定位系统,2018,43(4):42-47. |
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| 作者姓名： | 李涌涛 李建文 庞鹏 刘德智 李婧 |
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| 作者单位： | 1.信息工程大学 地理空间信息学院,河南 郑州 450001 |
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| 摘 要： | 为了进一步研究磁暴对电离层总电子含量变化的影响,基于2017年9月6日太阳爆发X93级特大耀斑并引发磁暴现象,文中将iGMAS提供的全球电离层总电子含量格网数据与中国科学院空间环境预报中心(SEPC)提供的磁暴环电流指数进行相关性分析,并重点分析了磁暴过程中不同阶段环电流指数与全球不同纬度带电离层总电子含量变化的相关性及影响,结果表明:1) 此次特大耀斑爆发13小时后发生大磁暴,磁暴主相阶段环电流指数与滞后1 h的电离层总电子含量相关系数为-0999 7,即随着磁暴加剧电离层总电子含量迅速增加,恢复相阶段迅速减少并趋于稳定;2) 电离层总电子含量变化随磁暴环电流指数变化而变化,两者变化趋势一致,磁暴强度与电离层总电子含量变化呈强负相关性,磁暴对不同纬度带的电离层总电子含量影响趋于一致,影响程度大小由高纬至低纬逐渐递减;3) 磁暴对不同纬度带的电离层总电子含量变化影响不同步,其影响存在由高纬逐渐延伸至低纬,磁暴主相阶段对不同纬度带的影响时延约为1 h,恢复相阶段时延逐渐消失,电离层电离层总电子含量变化趋于稳定;JP2]4) 此次磁暴恢复相阶段出现的电离层总电子含量异常变化,还有待进一步研究分析。
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| 关 键 词： | 电离层TEC 耀斑 磁暴 Dst指数 相关性 |
Analysis of the Magnetic Storm’s Influence on Ionospheric in September 2017 |
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| Institution: | 1.Information Engineering University, Zhengzhou 450001, China2.Xi′an Division of Surveying and Mapping, Xi′an 710054, China |
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| Abstract: | In order to study the effect of magnetic storm on the change of ionospheric TEC, this paper collects TEC global grid data from iGMAS and storm Dst index provided by SEPC during solar grade X93 large flares and magnetic storms on September 6 in 2017, and analyzes the correlation in different stages of magnetic storm between Dst index and TEC at different latitudes in the process of the magnetic storm. The results show that: 1)The large magnetic storm occurres 13 hours after the outbreak of the large flare, and the correlation coefficient between the ionospheric TEC lagging 1 hour and Dst index of the main phase during the magnetic storm is -09997, The ionospheric total electron content increase rapidly with the inten sification of magnetic starms, then decreases rapidly and tends to be stable during the recovery phase; 2) The change of TEC varies with the change of Dst index of magnetic storm, and the trends of the two changes are the same. The intensity of magnetic storm has a strong negative correlation with the change of TEC. The effect of magnetic storm on TEC of different latitudes tends to be consistent, and the degree of influence declines gradually from high latitude to low latitude; 3) The TEC changes in the high, medium and low latitudes after the magnetic storms are not synchronized. and the effect is taken in high, medium and low order. The delay of the influence on the different latitudes during the main phase of the magnetic storm is about 1 hour. The delay between Dst index and TEC delay gradually disappears during the recovery phase. With the storm reducing weak the ionospheric TEC change tends to be stable; 4) The abnormal changes of TEC occurre during the phase of magnetic storm recovery need to be further studied and analyzed. |
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