Two-dimensional imaging of large-scale traveling ionospheric disturbances over China based on GPS data
Two-dimensional imaging of large-scale traveling ionospheric disturbances over China based on GPS data
复制标题
基于GPS数据的中国大范围移动电离层扰动二维成像
DOI：
10.1029/2012ja017546
复制
发表时间：
2012-08-17
影响因子：
2.8
通讯作者：
Song, Qian
中科院分区：
文献类型：
--
作者：
Ding, Feng;Wan, Weixing;Song, Qian
[1]本文报道了利用中国GPS网数据对大尺度电离层行波扰动（LSTID）进行二维成像的初步结果，并结合电离层探空链对这些事件的观测。还制作了北美的2D TEC扰动图，以便在全球范围内研究LSTIDS。2011年5月28日的中等强度风暴期间，一场亚风暴的发展在午夜刚过的时候引发了北美上空的低速LSTID。随后，一个LSTID在1.5小时后，黄昏时分到达中国。第二次LSTID在午夜之前，亚暴爆发后6.6小时在中国上空观测到。中国地震的相锋宽度至少为1600 km，分别以540 - 85 m/s和362 - 89 m/s的速度向西南方向移动。电离层探测仪数据显示，黄昏事件的向下垂直相速度为75米/秒，夜间事件为60米/秒。虽然夜间LSTID比早前的黄昏事件向南传播得更远，但两者都在华南消失，这是由于低纬衰减增加所致。根据大气重力波的能量耗散方程，在低纬度地区，由于粘性和热传导，重力波的能量耗散严重，因为这种耗散随时间强烈增加，离子拖曳的能量耗散不太重要，但也不能忽略，因为背景TEC的增强;此外，低纬电离层的抬升是导致低纬TEC扰动幅度减小的另一个因素。引文：Ding，F.，W.万，B。宁，B。赵，英-地利河，巴西-地Zhang，B. Xiong和Q. Song（2012），基于GPS数据的中国大尺度电离层扰动二维成像，J. Geophys.结果：117，A08318，
[1] This paper reports the first results of the 2D imaging of large-scale traveling ionospheric disturbances (LSTID) using GPS network data from China, combined with observations of these events using an ionosonde chain. 2D TEC perturbation maps for North America were also constructed to allow the study of LSTIDs on a global scale. During the medium storm on 28 May 2011, the onset of a substorm initiated a slow-speed LSTID over North America just after midnight. Subsequently, an LSTID reached China 1.5 hours later, at dusk. A second LSTID was observed over China before midnight, 6.6 hours after substorm onset. The phase fronts of the China events had a front width of at least 1600 km, and moved southwestwards at a speed of 540 � 85 m/s and 362 � 89 m/s, respectively. Ionosonde data addressed a downward vertical phase velocity of � 75 m/s for the dusk event and � 60 m/s for the night event. Although the nighttime LSTID travelled farther south than the earlier dusk event, both disappeared in South China, and this was due to increase of the attenuation at low latitudes. According to the energy dissipation equation of atmospheric gravity waves there is severe dissipation due to viscosity and heat conductivity at low latitudes, since such dissipation increases strongly with time; dissipation due to ion drag is less important but cannot be ignored because of enhancement in background TEC; In addition, uplift of the ionosphere at low latitudes is another factor that results in a reduced amplitude of TEC perturbation at low latitudes. Citation: Ding, F., W. Wan, B. Ning, B. Zhao, Q. Li, R. Zhang, B. Xiong, and Q. Song (2012), Two-dimensional imaging of large-scale traveling ionospheric disturbances over China based on GPS data, J. Geophys. Res., 117, A08318,