A statistical study of large-scale traveling ionospheric disturbances observed by GPS TEC during major magnetic storms over the years 2003-2005
A statistical study of large-scale traveling ionospheric disturbances observed by GPS TEC during major magnetic storms over the years 2003-2005
复制标题
2003-2005年重大磁暴期间GPS TEC观测到的大范围移动电离层扰动统计研究
DOI：
10.1029/2008ja013037
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发表时间：
2008-07-04
影响因子：
2.8
通讯作者：
Perevalova, N. P.
中科院分区：
文献类型：
--
作者：
Ding, F.;Wan, W.;Perevalova, N. P.
本文绘制了二维总电子含量（TEC）摄动图，并研究了2003年至2005年主要磁暴期间大范围移动电离层扰动（LSTID）的统计特征。TEC数据是从北美洲北纬25度至55度地理纬度范围内的600多个GPS接收机获得的。我们总共发现了135个LSTID，其幅度为高达 3.5 TECU，最大车头宽度接近 4000 公里。周期、水平速度和方位角的平均值分别为 1.8 h、300 m/s 和 187 度（南偏西 7 度）。平均速度明显低于日本等低纬度地区观测到的速度。在所有 135 起 LSTID 事件中，根据在该地区观测到的磁 H 分量的变化，有 35 起（26%）发生在夜间，其来源可能在北美地区。此外，LSTID 的出现在 1200 LT 和 1900 LT 时达到峰值。还指出，极光地磁扰动发生的UT依赖性对于中纬度LSTID发生的UT依赖性和LT依赖性的形成起着重要作用。
In this paper, we plot two-dimensional total electron content (TEC) perturbation maps and investigate the statistical characteristics of large-scale traveling ionospheric disturbances (LSTIDs) during major magnetic storms from 2003 to 2005. The TEC data were obtained from more than 600 GPS receivers in North America within the geographical latitudes of 25 degrees N-55 degrees N. We found a total of 135 cases of LSTIDs, with amplitudes of up to 3.5 TECU and a maximum front width of similar to 4000 km. The mean value of periods, horizontal velocities, and azimuths are 1.8 h, 300 m/s, and 187 degrees (7 degrees west of south), respectively. The mean velocity is obviously slower than that observed at lower latitudes such as Japan. Of all the 135 LSTID events, 35 cases (26%) occurred in the nighttime with their possible source within the region of North America, according to the variation of magnetic H component observed in this region. In addition, the occurrence of LSTIDs peaks at 1200 LT and at 1900 LT. It is also pointed out that the UT dependence of the occurrence of auroral geomagnetic disturbances plays a major role in the forming of UT and LT dependence of the occurrence of LSTIDs observed at midlatitudes.