SWARM卫星观测到的一次台风消亡产生的电离层扰动

An ionospheric disturbance caused by the disintegration of a typhoon observed by the SWARM satellites

本文基于SWARM卫星观测数据,利用差分、傅里叶分析、小波变换等算法提取分析了两颗卫星观测记录到的磁场和等离子体的扰动信号,研究了2014年1月29日形成的1402号台风“剑鱼”消亡时产生的电离层扰动及其传播过程.结果表明,扰动信号的产生是突发的、瞬时的,在时空上与台风的消亡有良好的对应;扰动在各个参量上均有出现,且等离子体扰动早于磁场扰动;磁场扰动的主频突出,存在频移现象;异常信号向北传播过程中,在北纬40°附近,存在突然衰减和减速的情况.分析认为,台风消亡能够产生一定的声重力波或次声波,并在电离层对磁场、等离子体等产生一定程度的扰动.

In this paper,based on the observation data of the SWARM satellites,the disturbance of magnetic field and plasma recorded by two satellites are extracted and studied by differential,Fourier analysis,Wavelet transform and other algorithms.The ionospheric disturbance and its propagation process caused by the disintegration of the No.1402 typhoon"Kajiki"formed on January 29,2014 are studied.The results show that the generation of the disturbing signal is sudden and instantaneous,which has a good correspondence with the disintegration of the typhoon in time and space;the disturbance appears in all parameters,and the plasma disturbance is earlier than the magnet;the disturbance of the magnetic field has a prominent dominant frequency and frequency shift;during the northward propagation of the abnormal signal,there is a sudden attenuation and deceleration near 40°N.The analysis shows that the disintegration of the typhoon can generate acoustic gravity wave or infrasound wave,and generate some disturbance to the magnetic field and plasma in the ionosphere.