2004号台风“黑格比”路径电离层TEC的异常分析

Analysis of abnormal changes of ionospheric TEC in the track of No.2004 typhoon Hagupit

结合国际全球卫星导航系统(GNSS)服务组织(IGS)发布的全球垂直总电子含量(VTEC)数据,运用双线性插值、滑动时窗及四分位距方法,分析了2004号台风“黑格比”起编前7天至台风停编后1天,台风路径特征点上空电离层总电子含量(TEC)的异常情况,发现有正异常出现。参考地磁和太阳活动数据进一步研究发现,电离层异常集中发生在台风起编前第三天,台风起编后第二天,具体时段在世界协调时(UTC)6:00-10:00,异常属性全部为正异常,起初扰动范围多出现在台风路径以东区域,随时间推移不断自东向西移动,扰动强度先增大后减小;出现在停编后一天的电离层异常可能与电离层延迟有关。综合判断认为,2004号台风“黑格比”是引起这几日台风路径上空电离层形扰的原因,为研究台风-电离层扰动关系提供一定的参考。

In response to the 2004 typhoon‘Hagupit’,combined with the global Vertical Total Electron Content(VTEC)data released by the International GNSS(Global Navigation Satellite System)Services(IGS),using bilinear interpolation,sliding window and interquartile methods,the development process of the typhoon was analyzed.The abnormal conditions of the ionospheric Total Electron Content(TEC)over the characteristic points of the typhoon path were found to have negative anomalies within 7 days before the onset of the typhoon.The same situation occurred one day after the typhoon stopped.Further research with reference to geomagnetic and solar activity data found that ionospheric anomalies occurred concentratedly on the third day before the typhoon and the second day after the typhoon.The specific time period is from 6:00 to 10:00 Coordinated Universal Time(UTC).The anomalous attributes are all positive anomalies.At first,the disturbance range mostly appears in the area east of the typhoon track,and moves from east to west with the passage of time.The disturbance intensity increases first and then decreases.The ionospheric anomaly occurred one day after the typhoon stops may be related to the ionospheric delay.It is comprehensively judged that the 2004 typhoon‘Hagupit’is the cause of the ionospheric disturbance over the typhoon's path in the past few days,which provides a certain reference for studying the typhoon-ionospheric disturbance relationship.