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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 field aligned irregularities ： ウィキペディア英語版 field aligned irregularities Field Aligned Irregularities (FAIs) are anisotropic (different values when measured in different directions) perturbations of plasma density associated with magnetic fields. FAIs are often thought of in the context of the Earth's ionosphere where several natural processes generate FAIs in the E-region and F-region. They occur at 50 and 140 MHz, where electrons associated with the event become vertically aligned with Earth's magnetic field. FAI may occur for several hours after it starts. Optimum times for observance appear to be between 8 PM and midnight. ==References== 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「field aligned irregularities」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.