Ionospheric disturbances observed during the period of Mount Pinatubo eruptions in June 1991
Ionospheric disturbances observed during the period of Mount Pinatubo eruptions in June 1991
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DOI：
10.1029/92ja01462
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发表时间：
1992-11
期刊：
影响因子：
--
通讯作者：
K. Cheng;Yinn‐Nien Huang
中科院分区：
文献类型：
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作者：
K. Cheng;Yinn‐Nien Huang
1991年6月，皮纳图博火山发生了一系列的高潮性喷发。中坜的电离层虚高变化、伦平、高雄、知本的总电子含量变化以及伦平记录的差分多普勒频移数据都观测到了许多准周期电离层扰动。这些电离层扰动的特点是准周期波状列车持续几个周期，周期约为16至30分钟，波长在160至435公里之间，从皮纳图博山方向到观测地点的传播速度为131至259 m/s。振荡周期、扭曲的向下运动和倾斜的相锋都表明这些电离层扰动是由皮纳图博山方向到达的重力波表现出来的。通过使用简化的等温大气模型，传播模式被解释为自由传播的重力波。
A series of climactic eruptions of Mount Pinatubo occurred in June 1991. Many quasi‐periodic ionospheric disturbances were observed in the virtual height variations of the ionosphere at Chungli, in the total electron content variations at Lunping, Kaohsiung, and Chihpen, and in the differential Doppler shift data recorded at Lunping. These ionospheric disturbances were characterized by quasi‐periodic wavelike trains lasting for several cycles with periods around 16 to 30 min, wavelengths between 160 and 435 km, and propagation speeds ranging from 131 to 259 m/s from the direction of Mount Pinatubo to the observation sites. The oscillation periods, downward movement of distortion, and inclined phase fronts all show that these ionospheric disturbances were manifested by the gravity waves that arrived from the direction of Mount Pinatubo. By use of a simplified isothermal atmosphere model, the propagation mode is interpreted as the freely propagating gravity waves.