Geomagnetic pulsations caused by the Sumatra earthquake on December 26, 2004
Geomagnetic pulsations caused by the Sumatra earthquake on December 26, 2004
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DOI：
10.1029/2005gl024083
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发表时间：
2005-10-21
影响因子：
5.2
通讯作者：
Yang, FX
中科院分区：
文献类型：
--
作者：
Iyemori, T;Nose, M;Yang, FX
2004年12月26日苏门答腊岛地震发生后不久，在泰国的Phimai观测到了一个长周期的Pc5脉动。振荡的局域性和周期表明，长周期磁脉动是由低电离层的发电机作用产生的，当海底突然垂直运动时，大气压力脉冲以声波的形式垂直传播。据推测，在北纬10度的中国东海观测到的PC3型脉动，是地震引起的发电机电流的电场和磁场产生的磁声波与磁场线共振的结果。
A long period Pc5 pulsation was observed at Phimai in Thailand, shortly after the origin time of the Sumatra earthquake on December 26, 2004. The localized nature and the period of oscillations suggest that the long period magnetic pulsation was generated by dynamo action in the lower ionosphere, set up by an atmospheric pressure pulse which propagated vertically as an acoustic wave when the ocean floor suddenly moved vertically. It is speculated that a Pc3 type pulsation observed at Tong Hai in China, 10 degrees north of Phimai in latitude, was the result of magnetic field line resonance with a magnetosonic wave generated from the electric and magnetic fields of the dynamo current caused by the Earthquake.