On the Variation of the Atmospheric Potential Gradient caused by the Cloud of Smoke of the Volcano Asama. (The Fourth Report.)

[摘要] The variation of the atmospheric potential gradient caused by the cloud of eruption smoke of the Volcano Asama was recorded at the Karuizawa Meterological Station (9.4km from the crater). The variation is positive (about+300V/m) at first and then negative (about-1000V/m). It is concluded that the electric charge of positive sign is in the upper part of the cloud nd the charge of negative sign is in the lower part, and the quantity of the charge is about 0.4 coul, mb.

[学科分类] 大气科学