Localized field-aligned currents and 4-min TEC and ground magnetic oscillations during the 2015 eruption of Chile’s Calbuco volcano
Localized field-aligned currents and 4-min TEC and ground magnetic oscillations during the 2015 eruption of Chile’s Calbuco volcano
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2015 年智利卡尔布科火山喷发期间的局部场对准电流以及 4 分钟 TEC 和地磁振荡
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发表时间：
2016
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影响因子：
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通讯作者：
E. Safor
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作者：
Tadashi Aoyama;T. Iyemori;Kunihito Nakanishi;M. Nishioka;D. Rosales;O. Veliz;E. Safor
南部智利的Calbuco火山于2015年4月22日爆发。大约在第一次爆发后2小时，一群卫星在火山上方，并观察到小幅振幅（〜0.5 nt）的磁波的增强，而波袋结构在纬度上延伸了15°。光谱峰围绕垂直的声音共振周期（215和260 s）在位于磁性等方面的huancayo地磁观测室也被观察到。估计估计为720 m/s， 1600公里，这些观察结果强烈表明，爆炸性的火山喷发引起的大气波会产生TEC变化和电流。
The Calbuco volcano in southern Chile erupted on April 22, 2015. About 2 h after the first eruption, a Swarm satellite passed above the volcano and observed enhancement of small-amplitude (~0.5 nT) magnetic fluctuations with wave-packet structure which extends 15° in latitude. Similar wave packet is seen at the geomagnetic conjugate point of the volcano. Just after the eruption, geomagnetic fluctuations with the spectral peaks around the vertical acoustic resonance periods, 215 and 260 s, were also observed at Huancayo Geomagnetic Observatory located on the magnetic equator. Besides these observations, around 4-min, i.e., 175, 205 and 260 s, oscillations of total electron content (TEC) were observed at global positioning system stations near the volcano. The horizontal propagation velocity and the spatial scale of the TEC oscillation are estimated to be 720 m/s and 1600 km, respectively. These observations strongly suggest that the atmospheric waves induced by explosive volcanic eruption generate TEC variation and electric currents. The Swarm observation may be explained as a manifestation of their magnetic effects observed in the topside ionosphere.