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首页> 外文期刊>Journal of Geophysical Research, A. Space Physics: JGR >Geomagnetic Detection of the Atmospheric Acoustic Resonance at 3.8 mHz During the Hunga Tonga Eruption Event on 15 January 2022
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Geomagnetic Detection of the Atmospheric Acoustic Resonance at 3.8 mHz During the Hunga Tonga Eruption Event on 15 January 2022

机译：Geomagnetic Detection of the Atmospheric Acoustic Resonance at 3.8 mHz During the Hunga Tonga Eruption Event on 15 January 2022

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摘要

Modeling studies have predicted that the acoustic resonance of the atmosphere during geophysical events such as earthquakes and volcanos can lead to an oscillation of the geomagnetic field with a frequency of about 4 mHz. However, observational evidence is still limited due to scarcity of suitable events. On 15 January 2022, the submarine volcano Hunga Tonga-Hunga Ha'apai (20.5°S, 175.4°W, Tonga) erupted in the Pacific Ocean and caused severe atmospheric disturbance, providing an opportunity to investigate geomagnetic effects associated with acoustic resonance. Following the eruption, geomagnetic oscillation is observed at Apia, approximately 835 km from Hunga Tonga, mainly in the Pc 5 band (150-600 s, or 1.7-6.7 mHz) lasting for about 2 hr. The dominant frequency of the oscillation is 3.8 mHz, which is consistent with the frequency of the atmospheric oscillation due to acoustic resonance. The oscillation is most prominent in the eastward (Y) component, with an amplitude of ~3 nT, which is much larger than those previously reported for other events (2700 km). However, geomagnetic oscillation with a much smaller amplitude (~0.3 nT) is observed at Honolulu, which is located near the magnetic conjugate point of Hunga Tonga, in a similar wave form as at Apia, indicating interhemispheric coupling. This is the first time that geomagnetic oscillations due to the atmospheric acoustic resonance are simultaneously detected at magnetic conjugate points.
机译：研究预测,声学建模在地球物理共振的大气等事件会导致地震和火山一个振荡的地磁场大约4 mHz的频率。由于缺乏证据仍然很有限合适的事件。(20.5°S, 175.4°W,汤加)在太平洋地区爆发海洋和大气造成了严重的干扰,提供研究的机会地磁效应与声有关共振。振荡是观察到阿皮亚,大约835公里Hunga汤加,主要在个人电脑5乐队(150 - 600年代,或1.7 - -6.7 mHz)持续了约2人力资源。3.8 mHz,这与频率是一致的由于声大气振荡共振。东(Y)组件,振幅~ 3元,比以前要大得多其他事件的报道( 2700公里)。地磁振荡小得多振幅(~ 0.3元)是观察到火奴鲁鲁位于磁共轭附近是哪个Hunga汤加,相似的波形在阿皮亚,表明两半球间的耦合。这是第一次,地磁由于大气声学振荡同时检测到磁场共振共轭点。

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