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翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Distribution of lightning ： ウィキペディア英語版 Distribution of lightning The incidence of individual lightning strikes in any particular place is highly variable, but lightning does have an underlying spatial distribution. Previously, the frequency of lightning over the entire surface of the Earth was estimated to be 100 times a second. In 1997 NASA and National Space Development Agency (NASDA) of Japan launched the first Lightning Imaging Sensor (LIS)-equipped satellite to detect and record lightning.〔Lightning Imaging Sensor satellite and data () Accessed 15 Jul 2012〕 Lightning is now known to occur on average 44 (± 5) times a second over the entire Earth, making a total of about 1.4 billion flashes per year. ==Ratios of lightning types== The lightning flash rate averaged over the earth for intra-cloud (IC) + cloud-to-cloud (CC) to cloud-to-ground (CG) is at the ratio: (IC+CC):CG = 75:25. The base of the negative region in a cloud is normally at roughly the elevation where freezing occurs. The closer this region is to the ground, the more likely cloud-to-ground strikes are. In the tropics where the freeze zone is higher the (IC+CC):CG ratio is about 90:10. At the latitude of Norway (60° lat.) where the freezing elevation is lower the (IC+CC):CG ratio is about 50:50.〔Uman, Martin A.' "All About Lightning"; Ch. 8; p. 68, Dover Publications N.Y.; 1986; ISBN 9780486252377〕 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Distribution of lightning」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.