由卫星和地面联合观测揭示的大气-电离层对东北M9地震的响应。初步结果
Atmosphere-Ionosphere Response to the M9 Tohoku Earthquake Revealed by Joined Satellite and Ground Observations. Preliminary results
摘要：
2011年3月11日发生的日本东北部9级地震是有史以来袭击这个国家的最大地震。我们回顾性分析了四个不同的物理参数的时间和空间变化-出射长波辐射（OLR），GPS/TEC，低地球轨道层析成像和临界频率foF 2。这些变化是地震发生前几天大气层和电离层状态的特征。我们的第一个结果表明，在3月8日发射的红外辐射迅速增加，从卫星数据和异常发展的震中附近。GPS/TEC数据表明电子密度的增加和变化在3月8日达到最大值。从这一天开始，在低电离层也证实了震中上空的异常TEC变化。3月3日至11日，日本所有四个地面电离层探测仪都记录到电子浓度大幅增加，并在主地震后恢复正常。我们发现大气和电离层异常与东北地震之间存在正相关关系。本研究有助于更好地了解大气层/电离层对东北大地震的响应
英文摘要：
The recent M9 Tohoku Japan earthquake of March 11, 2011 was the largest recorded earthquake ever to hit this nation. We retrospectively analyzed the temporal and spatial variations of four different physical parameters - outgoing long wave radiation (OLR), GPS/TEC, Low-Earth orbit tomography and critical frequency foF2. These changes characterize the state of the atmosphere and ionosphere several days before the onset of this earthquake. Our first results show that on March 8th a rapid increase of emitted infrared radiation was observed from the satellite data and an anomaly developed near the epicenter. The GPS/TEC data indicate an increase and variation in electron density reaching a maximum value on March 8. Starting on this day in the lower ionospheric there was also confirmed an abnormal TEC variation over the epicenter. From March 3-11 a large increase in electron concentration was recorded at all four Japanese ground based ionosondes, which return to normal after the main earthquake. We found a positive correlation between the atmospheric and ionospheric anomalies and the Tohoku earthquake. This study may lead to a better understanding of the response of the atmosphere /ionosphere to the Great Tohoku earthquake
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