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首页> 外文期刊>Journal of Geophysical Research, A. Space Physics: JGR >Ionosonde tracking of infrasound wavefronts in the thermosphere launched by seismic waves after the 2010 M8.8 Chile earthquake
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Ionosonde tracking of infrasound wavefronts in the thermosphere launched by seismic waves after the 2010 M8.8 Chile earthquake

机译:Ionosonde跟踪的次声的波阵面时热大气层后发起的地震波2010年M8.8智利地震

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摘要

Ionospheric disturbances associated with the M8.8 Chile earthquake (35.91°S, 72.73°W) on 27 February 2010 were observed at Kazan, Russia (55.85°N, 48.81°E). Rapid-run ionograms at 1 min intervals exhibited multiple-cusp signatures (MCSs) for more than 30 min, which have been observed several times after large earthquakes. The ionospheric disturbances were caused by infrasound propagating upward in the atmosphere, which modified the electron density distribution through ion-neutral collisions. The anomaly of the vertical electron density distribution responsible for the MCSs was analyzed by converting the ionogram traces into real height profiles. The density profiles at 1 min intervals allowed the tracking of the vertical propagation of infrasound and provided information on parameters of acoustic waves, which was not possible from the previous measurements such as standard ionograms at 5–15 min intervals, HF Doppler soundings, and total electron content using satellite beacon signals. The speed of acoustic waves in the thermosphere was evaluated from the consecutive ionograms with MCSs, and it was found that the thermospheric temperature was slightly higher than that calculated using the Mass Spectrometer and Incoherent Scatter Radar empirical model (NRLMSISE-00).
机译:电离层扰动与M8.8有关智利地震(35.91°S, 72.73°W) 27日2010年2月被观察到在喀山,俄罗斯间隔展出multiple-cusp签名(mcs)超过30分钟,观察了几次大地震之后。电离层扰动引起的次声传播向上的氛围,修改了电子密度分布通过ion-neutral碰撞。垂直的电子密度分布负责分析了mcs将电离图跟踪转化为真正的高度配置文件。允许跟踪的垂直传播次声和提供信息声波的参数,这不是可能从以前的测量等标准电离图5 - 15分钟的间隔,高频多普勒试探,总电子含量利用卫星信标信号。声波在热电离层评估从连续电离图mcs,发现thermospheric温度是什么略高于计算使用质谱计和非相干散射雷达经验模型(NRLMSISE-00)。

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