.蘇俊育-星空下的閃電
( Lightning Beneath the Starry Skies)
閃電的形成與雷雲中空氣、水和冰流動強度有關。雲團裡的強烈氣流讓水滴和冰晶充滿靜電,重量較輕、帶正電的堆積於雲層上方;較重、帶負電的在底部,地面則因雲層底部大量負電的影響帶正電。當相反電位累積到一定程度,電場足以將空氣擊穿,形成雲中放電,而這種強大電場如果是在雲和地面間形成,就會導致雲對地放電產生叉狀閃電。當月光從雲隙間透出,在星空下捕捉雲中放電和雲對地之叉狀閃電,格外珍奇。
Thecause of lightning is determined by the intensity of the currents of air, water and ice inside the dark cloud. Intense currents in the cloud fill the water droplets and ice crystals with static electricity. The lightweight positive electrostatic charges pile on the upper layer of cloud, while the heavier negative charges gather at the bottom. The ground produces positive electrostatic charges due to the negative electrostatic charges at the bottom part of the cloud. When opposite electrons accumulate to a certain level, the electric field will pierce through the air and discharge electricity within the clouds. If this high-powered electric field is formed between the clouds and ground, the fork shaped lightning will then be discharged. It is spectacular to see the in cloud lightning and cloud to ground fork shape lightning, when the moonlight peers through the clouds.
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