赤道异常特征对桂林地区L波段电离层闪烁逐日变化的影响

The influence of EIA features on the day-to-day variability of L-band ionospheric scintillations at Guilin

为了研究桂林地区L波段电离层闪烁逐日变化的原因,利用桂林地区(地理坐标:25.29°N,110.33°E;地磁坐标:15.04°N,181.98°E)的L波段电离层闪烁监测仪GSV4004的观测数据和国际GNSS服务中心(IGS)提供的全球VTEC数据,在磁平静条件下研究东经110°地区的赤道异常特征对桂林地区L波段电离层闪烁逐日变化的影响。结果表明,与非闪烁日相比,东经110°地区的赤道异常特征在闪烁日内有明显区别。闪烁日日落后的赤道异常复苏现象更为明显,主要表现为:赤道异常峰区的VTEC数值更大,峰区与谷区的VTEC比值更大,峰区与谷区之间的VTEC梯度更大,日落后的赤道异常复苏现象持续时间更长,且日落后复苏的赤道异常结构的北峰所处的纬度更高。

In order to study the reason of the day-to-day variability of L-band ionospheric scintillations at Guilin,the influ-ences of equatorial ionization anomaly （EIA）features along 110°E longitude on the day-to-day variability of L-band iono-spheric scintillations at Guilin （geographic coordinates：25.29°N,110.33°E;geomagnetic coordinates：15.04°N,181.98°E） have been investigated under quiet geomagnetic conditions on the basis of L-band ionospheric scintillations data obtained by an ionospheric scintillation monitor GSV4004 installed at Guilin and the global vertical total electron content （VTEC）data provided by the international GNSS service （IGS）.The results show that the EIA features along 110°E longitude in scintilla-tion days are very different from those in non-scintillation days.The resurgence-like features of EIA during the post-sunset period are much more pronounced in scintillation days.Namely,VTEC at the crest of EIA is larger in scintillation days,the ratio of VTEC crest to VTEC trough is larger in scintillation days,the VTEC gradient in the regions between VTEC crest and trough is larger in scintillation days,the duration of the resurgence-like features of EIA lasts longer in scintillation days, and the latitude of the north crest of the resurgent EIA is higher in scintillation days.