Self-charging of the Eyjafjallajokull volcanic ash plume
Self-charging of the Eyjafjallajokull volcanic ash plume
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DOI：
10.1088/1748-9326/5/2/024004
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发表时间：
2010-04-01
影响因子：
6.7
通讯作者：
Mather, T. A.
中科院分区：
文献类型：
--
作者：
Harrison, R. G.;Nicoll, K. A.;Mather, T. A.
火山羽流通过羽流粒子的带电产生闪电。从2010年4月苏格兰埃亚菲亚德拉冰盖羽流的原位气球采样中观察到距离其源头超过1200公里的火山羽流充电。虽然水平羽流的上边缘和下边缘充电预计从晴朗的天气大气电，苏格兰上空的羽流显示持续的正电荷远低于上羽流边缘。在离震源如此远的地方，充电不可能是喷发本身的残余，因为大气中有限导电性的电荷弛豫。
Volcanic plumes generate lightning from the electrification of plume particles. Volcanic plume charging at over 1200 km from its source was observed from in situ balloon sampling of the April 2010 Eyjafjallajokull plume over Scotland. Whilst upper and lower edge charging of a horizontal plume is expected from fair weather atmospheric electricity, the plume over Scotland showed sustained positive charge well beneath the upper plume edge. At these distances from the source, the charging cannot be a remnant of the eruption itself because of charge relaxation in the finite conductivity of atmospheric air.