The observations of Global Positioning System(GPS) scintillation,Total Electron Content(TEC)depletion,the periodic structure of TEC and Rate of TEC Index(ROTI) over south China were presented.Data were collected from ...The observations of Global Positioning System(GPS) scintillation,Total Electron Content(TEC)depletion,the periodic structure of TEC and Rate of TEC Index(ROTI) over south China were presented.Data were collected from GPS observations at stations of Shenzhen and Guangzhou from 2011 to 2012.This study reported that the ratio of simultaneous occurrences of TEC depletions with strong scintillations was higher than that of TEC depletions with weak scintillations in vernal and autumnal equinoxes of 2011 over South China.The number of the periodic structures of TEC with depletion contained was greater than that with no depletion contained corresponding to strong scintillations.The structure of the slab of plasma irregularities could be responsible for the simultaneous occurrences of TEC depletion with strong scintillations and ROTI.Before and during the occurrences of strong scintillation,there was Large-Scale Wave Structure(LSWS) which provided the seed ionization perturbation to trigger ESF irregularities and contributed to the periodic structure of TEC.展开更多
基于IGS提供的TEC数据,研究了2003年10月大磁暴期间的暴时密度增强(Storm EnhancedDensity,SED)现象;利用GPS观测数据,计算出ROTI(Standard deviations of ROT)指数,分析了SED边界附近电离层小尺度不均匀体结构的时间和空间演变.研究表...基于IGS提供的TEC数据,研究了2003年10月大磁暴期间的暴时密度增强(Storm EnhancedDensity,SED)现象;利用GPS观测数据,计算出ROTI(Standard deviations of ROT)指数,分析了SED边界附近电离层小尺度不均匀体结构的时间和空间演变.研究表明,在磁暴主相期间SED边界附近不均匀体随着磁暴的发展逐渐增多;在主相的中后期不均匀体的分布密集度达到最大;在恢复相期间,不均匀体分布很少;随着磁暴的发展,不均匀体开始主要集中在40°～45°N范围内,随后向高纬漂移,主要集中在45°～55°N范围内.展开更多
基金Supported by the National Natural Science Young Foundation of China(41704168)。
文摘The observations of Global Positioning System(GPS) scintillation,Total Electron Content(TEC)depletion,the periodic structure of TEC and Rate of TEC Index(ROTI) over south China were presented.Data were collected from GPS observations at stations of Shenzhen and Guangzhou from 2011 to 2012.This study reported that the ratio of simultaneous occurrences of TEC depletions with strong scintillations was higher than that of TEC depletions with weak scintillations in vernal and autumnal equinoxes of 2011 over South China.The number of the periodic structures of TEC with depletion contained was greater than that with no depletion contained corresponding to strong scintillations.The structure of the slab of plasma irregularities could be responsible for the simultaneous occurrences of TEC depletion with strong scintillations and ROTI.Before and during the occurrences of strong scintillation,there was Large-Scale Wave Structure(LSWS) which provided the seed ionization perturbation to trigger ESF irregularities and contributed to the periodic structure of TEC.
文摘基于IGS提供的TEC数据,研究了2003年10月大磁暴期间的暴时密度增强(Storm EnhancedDensity,SED)现象;利用GPS观测数据,计算出ROTI(Standard deviations of ROT)指数,分析了SED边界附近电离层小尺度不均匀体结构的时间和空间演变.研究表明,在磁暴主相期间SED边界附近不均匀体随着磁暴的发展逐渐增多;在主相的中后期不均匀体的分布密集度达到最大;在恢复相期间,不均匀体分布很少;随着磁暴的发展,不均匀体开始主要集中在40°～45°N范围内,随后向高纬漂移,主要集中在45°～55°N范围内.
文摘基于加拿大地区高纬度电离层观测网的电离层闪烁观测数据,分析了2018年8月26日地磁暴事件引发的北半球高纬度地区电离层总电子含量(TEC)异常变化、TEC变化率指数(ROTI)及电离层相位闪烁的变化特征.结果表明:加拿大地区最大异常值约6 TECU,磁暴引发全球电离层TEC异常峰值高达20 TECU;加拿大地区电离层相位闪烁发生率最大增至12.6%,而磁静日期间约为1%;强电离层闪烁期间,电离层相位闪烁指数与ROTI之间具有较强的一致性.对GPS双频精密单点定位(Precise Point Positioning,PPP)结果进行分析发现:无闪烁期间定位误差随测站纬度的增高呈现出增大趋势,但均方根误差小于0.4m;闪烁发生期间各测站的定位误差均显著增大,水平和垂直方向定位误差分别增至约0.9m及1.7m.
