Statistical Study of Medium-Scale Traveling Ionospheric Disturbances Observed with a GPS Receiver Network in Japan
Statistical Study of Medium-Scale Traveling Ionospheric Disturbances Observed with a GPS Receiver Network in Japan
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DOI：
10.1007/978-94-007-0326-1_21
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发表时间：
2011
期刊：
影响因子：
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通讯作者：
Y. Otsuka;N. Kotake;K. Shiokawa;T. Ogawa;T. Tsugawa;A. Saito
中科院分区：
文献类型：
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作者：
Y. Otsuka;N. Kotake;K. Shiokawa;T. Ogawa;T. Tsugawa;A. Saito
利用日本密集分布的GPS接收机，研究了经纬度分辨率为0.15×0.15°的总电子含量（TEC）扰动的二维分布图，以揭示中尺度电离层行波扰动（MSTID）的统计特征。我们发现，MSTID可以分为三类：白天，夜间，黎明和黄昏MSTID。白天MSTID经常发生在冬季，并倾向于向东南传播。我们推测白天的MSTID是由热层大气重力波引起的。夜间多发于夏季，向西南传播。这种传播方向支持极化电场在产生夜间MSTID中发挥重要作用的观点。黎明和黄昏MSTID经常发生在夏季，并分别向东和西北偏北方向传播。
Using densely spaced GPS receivers in Japan, we investigated two-dimensional maps of total electron content (TEC) perturbations with a spatial resolution of 0.15×0.15° in longitude and latitude to reveal the statistical characteristics of medium-scale traveling ionospheric disturbances (MSTIDs). We found that MSTIDs can be categorized into three groups: daytime, nighttime, and dawn and dusk MSTIDs. Daytime MSTIDs frequently occur in winter and tend to propagate southeastward. We speculate that daytime MSTIDs are caused by atmospheric gravity waves in the thermosphere. Nighttime MSTIDs frequently occur in summer and propagate southwestward. This propagation direction supports the notion that polarization electric fields could play an important role in generating nighttime MSTIDs. Dawn and dusk MSTIDs frequently occur in summer and propagate eastward and north-northwestward, respectively.