中纬度地区粒子沉降和太阳耀斑对甚低频传播的影响分析

Analysis of Particle Sedimentation and Solar Flares on VLF Propagation in Mid-latitude Region

通过观测俄罗斯Alpha甚低频导航台到中纬度地区(新乡)之间的甚低频(VLF)信号的相位变化数据,发现在2002-07-17-2002-07-20期间,VLF信号发生了多次相位超前现象,观测到在2002-07-19和2002-07-20发生了高能粒子沉降事件,并分析出此次事件是由2002-07-17和2002-07-18发生的太阳耀斑引起.通过与美国发布的GOES卫星数据进行对比,发现两者的数据有很好的一致性.粒子沉降和太阳耀斑都会使甚低频信号的相位发生相位超前.粒子沉降大多数情况发生在极区,本次在新乡地区观测到高能粒子沉降,是一次极为宝贵的观测数据,对研究中纬度地区的高能粒子沉降有很大的作用.

By observing the very low frequency （VLF） VLF phase anomalies from the Russian Alpha navigation station in mid latitude regions （Xinxiang） , we find VLF signal phase leading phenomenon during July 17th, 2002 and July 20th, 2002. Then we observe high-energy particles sedimentation events in the mid latitude zone on July 19th,2002 and July 20th, 2002, So we analyze those events which are caused by solar flares occurring on July 17th, 2002 and July 18th, 2002. By comparing the GOES satellite data released by the US, we find that they are in good agreement with dates we observe.So VLF signal phase have a good correlation with the solar flare and high-energy particle sedimentation, it confirms the correctness of the analysis. The majority of particle sedimentation occur in the polar regions, Particle sedimentation observed in the Xinxiang is an extremely valuable data, it will have a great effect on studying the high-energy particle sedimentation of latitude regions.