…Any day on which lightning discharges (lightning and thunder) are observed is counted as a thunderstorm day, regardless of the number of times. The line connecting points with an equal number of thunderstorm days is called the isokeraunic level (IKL), and is used to show the regional distribution of thunderstorms. Figure 2 shows the annual distribution of thunderstorm days in Japan. *Some of the terminology that mentions "isokeraunic level" is listed below. Source | Heibonsha World Encyclopedia 2nd Edition | Information |
…雷放電(電光,雷鳴)が観測される日は,その回数は問わず雷雨日として計上される。雷雨日数の等しい地点を結ぶ線を等雷雨日数線isokeraunic level(IKL)とよび,雷雨の地域分布を表すのに用いられる。日本の年間の雷雨日数分布を図2に示す。… ※「isokeraunic level」について言及している用語解説の一部を掲載しています。 出典|株式会社平凡社世界大百科事典 第2版について | 情報 |
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