Medium‐scale traveling ionospheric disturbances detected with dense and wide TEC maps over North America
Medium‐scale traveling ionospheric disturbances detected with dense and wide TEC maps over North America
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DOI：
10.1029/2007gl031663
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发表时间：
2007-11
影响因子：
5.2
通讯作者：
T. Tsugawa;Yuichi Otsuka;A. Coster;A. Saito
中科院分区：
文献类型：
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作者：
T. Tsugawa;Yuichi Otsuka;A. Coster;A. Saito
利用多个GPS接收器网络，利用北美上空密集而宽广的去趋势总电子含量(TEC)图探测夜间和白天中尺度电离层行进扰动(MSTID)。TEC地图覆盖60-130°W和24-54°N(地磁纬度30-65°N)的宽广区域，具有1.05°×1.05°经纬度(0.15°×0.15°，7×7像素平滑)的空间分辨率和30秒的时间分辨率。TEC地图首次显示，夜间MSTID向西南方向传播，在北美上空波长为200-500公里，波前长度超过∼2,000公里。我们还观察到波长为300-1000公里的白天MSTID向东南方向传播，直到下午三点左右，并在下午晚些时候向西南方向传播。在下午中后期，这些向不同方向传播的MSTID叠加在一起。TEC图谱可以成为研究MSTID的一种新的强有力的工具。
Nighttime and daytime medium‐scale traveling ionospheric disturbances (MSTIDs) are detected with dense and wide detrended total electron content (TEC) maps over North America using multiple GPS receiver networks. The TEC maps cover a wide region of 60–130°W and 24–54°N (30–65°N in geomagnetic latitude), and have a spatial resolution of 1.05° × 1.05° in latitude and longitude (0.15° × 0.15° with 7 × 7 pixel smoothing) and a temporal resolution of 30 seconds. The TEC maps reveal, for the first time, that the nighttime MSTIDs propagate southwestward with 200–500 km wavelengths over North America and have wavefronts longer than ∼2,000 km. We also observe that daytime MSTIDs with 300–1,000 km wavelengths propagate southeastward until mid‐afternoon and southwestward in the late afternoon. In the mid‐to‐late afternoon, these MSTIDs propagating in the different directions are superimposed. The TEC maps can be a new powerful tool to investigate the MSTIDs.