利用GPS数据研究江西区域电离层对台风“潭美”的响应

Research on the Response of Jiangxi Ionosphere to Typhoon “Trami” by GPS Data

以2013年8月22日途经江西的台风"潭美"为研究背景,利用江西连续运行参考站(CORS)获取的GPS数据反演高精度TEC,对台风"潭美"登陆前后多天电离层的TEC进行了分析,发现:8月22日电离层TEC变化存在异常,且在台风登陆前TEC变化在逐渐增大,台风过境后TEC变化值出现下降趋势;进一步对台风登陆前后一段时间的TEC时间序列进行谱分析后,认为8月22日电离层TEC的扰动很可能与台风有关;对台风当天即8月22日各站点进行时间序列和空间强度分析,结果表明距离台风路径越远,TEC的扰动强度越小。进一步确认8月22日的电离层异常与台风具有相关性。

The ionospheric total electron content( TEC) disturbances of the severe tropical storm Trami which occurred on 22 August 2013 in the Jiangxi was studied using spectrum analysis. The TEC data from the two-frequency ground-based GPS receivers of CORS network in Jiangxi was processed. Results show that the TEC variation ranges increased gradually before the typhoon landed and decreased gradually after the typhoon. The TEC variation amplitudes are more pronounced when typhoon occurred,after analyzing the TEC for a period of time before and after typhoon landed. Furthermore,it is considered that the TEC disturbances are likely to be related to typhoon"Trami"in 22 August,after the spectrum analysis of TEC time series. By analyzing the time series and the spatial intensity of typhoon in 22 August,it has been demonstrated that the farther away from the typhoon path,the smaller the disturbance intensity of TEC. A series of results further confirm that typhoon can influence the ionospheric state.