Storm induced large scale TIDs observed in GPS derived TEC
Storm induced large scale TIDs observed in GPS derived TEC
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DOI：
10.5194/angeo-27-1605-2009
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发表时间：
2009-04
影响因子：
1.9
通讯作者：
C. Borries;N. Jakowski;V. Wilken
中科院分区：
文献类型：
--
作者：
C. Borries;N. Jakowski;V. Wilken
抽象的。这项工作是首次使用 GNSS 测量得出的总电子含量 (TEC) 数据对欧洲大规模移动电离层扰动 (LSTID) 进行统计分析。欧洲的 GNSS 接收器网络足够密集，能够以高水平分辨率绘制电离层扰动 TEC。分析得出的扰动 TEC 地图，研究空间天气事件对欧洲上空电离层的影响。在几次地磁风暴期间已经确定了向赤道传播的风暴诱发波包。速度、波长和方向等特征参数是根据扰动 TEC 图估计的。显示平均波长为 2000 km、平均周期为 59 分钟、平均相速度为 684 ms -1，扰动分配给 LSTID。与在日本观察到的 LSTID 的比较显示，波长相同，但相速度快得多。这可能是由于到极光区域的距离或地磁场线的倾角/偏角的差异。观察到的 LSTID 振幅与极光电射流 (AE) 之间的相关性表明，大多数波状扰动是由焦耳热引起的。颗粒沉淀效应无法分离。
Abstract. This work is a first statistical analysis of large scale traveling ionospheric disturbances (LSTID) in Europe using total electron content (TEC) data derived from GNSS measurements. The GNSS receiver network in Europe is dense enough to map the ionospheric perturbation TEC with high horizontal resolution. The derived perturbation TEC maps are analysed studying the effect of space weather events on the ionosphere over Europe. Equatorward propagating storm induced wave packets have been identified during several geomagnetic storms. Characteristic parameters such as velocity, wavelength and direction were estimated from the perturbation TEC maps. Showing a mean wavelength of 2000 km, a mean period of 59 min and a phase speed of 684 ms −1 in average, the perturbations are allocated to LSTID. The comparison to LSTID observed over Japan shows an equal wavelength but a considerably faster phase speed. This might be attributed to the differences in the distance to the auroral region or inclination/declination of the geomagnetic field lines. The observed correlation between the LSTID amplitudes and the Auroral Electrojet (AE) indicates that most of the wave like perturbations are exited by Joule heating. Particle precipitation effects could not be separated.