カテゴリ: 論文誌(論文単位)グループ名: 【B】電力・エネルギー部門発行日: 2012/06/01タイトル(英語): Seasonal Variation of Frequency of High Current Lightning Discharges Observed by JLDN著者名: Mikihisa Saito (The University of Tokyo), Masaru Ishii (The University of Tokyo), Fumiyuki Fujii (The University of Tokyo), Michihiro Matsui (Franklin Japan Corporation)著者名(英語): Mikihisa Saito (The University of Tokyo), Masaru Ishii (The University of Tokyo), Fumiyuki Fujii (The University of Tokyo), Michihiro Matsui (Franklin Japan Corporation)キーワード: lightning，winter lightning，upward lightning，LLS，high-current要約(英語): Seasonal variations of number of high current lightning discharges exceeding 100kA observed by JLDN (Japanese Lightning Detection Network) were analyzed. The months with averaged altitudes of -10℃ level higher than 5.7km are classified as ordinary summer from the viewpoint of lightning activity. Meanwhile, on the coast of the Sea of Japan, more than 90% of negative high current lightning discharges were -GC (Ground to Cloud) strokes in the months when monthly averaged altitudes of -10℃ level are lower than 2.7km. These months are classified as the winter lightning season when upward lightning flashes frequently occur. Months other than winter or summer are classified as spring or autumn. In these seasons, the proportions of positive high current lightning discharges are higher than those of negative discharges like winter. Thus, the charge structure in the thunderclouds of spring and autumn may be similar to that in winter, and high current lightning strokes tend to occur. Since this variation of seasons is different in each area of Japan, relation of seasons, areas, and densities of high current lightning discharges were analyzed.本誌: 電気学会論文誌B（電力・エネルギー部門誌） Vol.132 No.6 （2012） 特集：冬季雷，正極性雷，高建造物への落雷（ISWL）本誌掲載ページ: 536-541 p原稿種別: 論文／英語電子版へのリンク: https://www.jstage.jst.go.jp/article/ieejpes/132/6/132_536/_article/-char/ja/
