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A numerical simulation of ionospheric and atmospheric variations associated with the Sumatra earthquake on December 26, 2004

机译：2004年12月26日与苏门答腊地震有关的电离层和大气变化的数值模拟

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In the Sumatra earthquake that occurred on December 26, 2004, significant ionospheric variations were detected immediately after the earthquake in both the TEC (total electron content) data of GPS (Global Positioning System) and the ionosonde data. A magnetic pulsation with a period of about 4 min was also observed in Phimai, Thailand. Recent studies have suggested that these events are associated with acoustic waves excited by a sudden large-scale displacement of the sea surface around the epicenter. In order to study these phenomena quantitatively, a time-dependent two-dimensional nonhydrostatic compressible atmosphere-ionosphere model has been used and compared with relevant data. By modeling in sea surface perturbation, we were able to reproduce an atmospheric oscillation with a period of about 4 min in the upper atmosphere above the epicenter. The electron density variations observed by GPS/TEC and by ionosondes were also reproduced fairly well. We found that the observed TIDs (traveling ionospheric disturbances) with long periods are caused by the ducted thermospheric gravity waves produced in the thermosphere through acoustic pulse from the epicenter. The good overall agreement between the simulation results and observations indicates that numerical simulation with the nonhydrostatic compressible atmosphere-ionosphere model could be a useful tool to investigate the relationship between variations in the upper atmosphere and various sources of disturbances in the lower atmosphere.
机译：在2004年12月26日发生的苏门答腊地震中，地震发生后立即在GPS（全球定位系统）的TEC（总电子含量）数据和离子探空仪数据中发现了明显的电离层变化。在泰国披迈也观察到了大约4分钟的电磁脉冲。最近的研究表明，这些事件与震中周围海面突然大规模位移所激发的声波有关。为了定量研究这些现象，使用了时变的二维非静压可压缩大气电离层模型，并将其与相关数据进行了比较。通过对海面扰动进行建模，我们能够在震中上方的高层大气中重现大约4分钟的大气振荡。 GPS / TEC和离子探空仪观测到的电子密度变化也得到了很好的再现。我们发现，长时间观测到的TID（行进电离层扰动）是由热球通过震中产生的声脉冲在热球中产生的管道热球重力波引起的。模拟结果与观测值之间的良好总体吻合表明，使用非静压可压缩大气-电离层模型进行的数值模拟可能是研究高层大气变化与底层大气各种干扰源之间关系的有用工具。

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