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首页> 外文期刊>Journal of Geophysical Research, A. Space Physics: JGR >Two-dimensional imaging of large-scale traveling ionospheric disturbances over China based on GPS data
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Two-dimensional imaging of large-scale traveling ionospheric disturbances over China based on GPS data

机译：二维成像的大规模的旅行基于GPS的电离层扰动对中国数据

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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.
机译：本文报告的第一个结果2 d成像的大型旅游电离层干扰(LSTID)使用GPS网络数据中国,结合观察这些事件使用一个ionosonde链。北美地图也被构造允许LSTIDs的研究在全球范围内。2011年5月28日在风暴中发病亚暴发起一个低速LSTID结束北美午夜后。LSTID达成中国1.5小时后,黄昏时分。第二个观察LSTID之前在中国午夜,亚暴发病后6.6小时。阶段方面中国事件面前宽度至少1600公里,和感动朝着540±85 m / s的速度分别为362±89 m / s。解决一个向下的垂直相速度~ 75 m / s的黄昏事件和~ 60 m / s晚上活动。更远的南部比早些时候的黄昏事件,都消失在中国南方,这个是由于增加低衰减的纬度。大气重力波方程严重的由于粘度和热耗散电导率在低纬度地区,因为这样耗散的增加与时间;耗散不太重要,但由于离子拖累不容忽视的增强背景侦探;在低纬度地区电离层是另一个因素这导致减少了TEC的振幅在低纬度扰动。

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