京津冀地区电离层时空特性分析

Analysis of ionosphere TEC temporal-spatial characteristics in Beijing-Tianjin-Hebei area

为了研究分析京津冀地区的电离层时空变化特性,为本地区提供高精度导航定位和授时(PNT)服务,该文以国际GNSS服务(IGS)中心提供的2000—2018年的全球电离层总电子含量(TEC)格网模型产品数据为基础,研究该区域电离层时空分布特性及太阳活动与电离层的相关性。结果表明:电离层TEC与F10.7指数相关系数为0.83,与太阳黑子数相关系数为0.78,与太阳活动呈现出高度相关性;京津冀地区TEC每日最大值出现在UTC4时左右,电离层TEC具有较明显的27 d周期特性,在太阳活动高年及TEC极大递减年会出现冬季异常现象;白天,同一经度TEC值随纬度的升高而降低;同一纬度TEC值随经度的升高没有明显变化。

To study and analyze the spatiotemporal characteristics of the ionosphere in the Beijing-Tianjin-Hebei area,it can provide high-precision positioning,navigation and timing(PNT)services for the area.This article was basedon the 2000-2018 global ionospheric total electron content(TEC)grid model product data provided by the International GNSS Service(IGS)Center,this paper studied the temporal and spatial distribution characteristics of the ionosphere and the correlation between solar activity and the ionosphere.The results showed that the correlation coefficient between ionospheric TEC and F10.7 index was 0.83,and the correlation coefficient with sunspot number was 0.78,which was highly correlated with solar activity.The maximum daily value of TEC appeared around UTC4,the ionospheric TEC had a relatively obvious 27-day periodicity,winter anomalies occured in years when solar activity was high and TEC was greatly reduced.During the day and the same longitude,the TEC decreased with increasing latitude;at the same latitude,TEC did not change with longitude.