翻訳と辞書 Words near each other ・ K-Y Jelly ・ K-Z ・ K. (novel) ・ K-frame ・ K-function ・ K-Gee ・ K-graph C*-algebra ・ K-group ・ K-Hill (artist) ・ K-Hito ・ K-Hits ・ K-hole ・ K-homology ・ K-ID ・ K-independent hashing ・ K-index ・ K-index (meteorology) ・ K-Jee ・ K-K-K-Katy ・ K-Klass ・ K-LEE Radio ・ K-Liber ・ K-Line ・ K-line ・ K-line (artificial intelligence) ・ K-line (spectrometry) ・ K-Lite Codec Pack ・ K-Lo ・ K-Love ・ K-Lyinn Dictionary Lists mini英和辞書 mini和英辞書 Webster 1913 Latin-English FOLDOC Wikipedia English ウィキペディア

翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク K-index ： ウィキペディア英語版 K-index The ''K''-index quantifies disturbances in the horizontal component of earth's magnetic field with an integer in the range 0–9 with 1 being calm and 5 or more indicating a geomagnetic storm. It is derived from the maximum fluctuations of horizontal components observed on a magnetometer during a three-hour interval. The label ''K'' comes from the German word ''Kennziffer''〔Bartels, J., Heck, N.H. & Johnston, HF. (1939). The three-hour range index measuring geomagnetic activity. ''Geophysical Research'', ''44'', 411–454.〕 meaning “''characteristic digit''”. The ''K''-index was introduced by Julius Bartels in 1938.〔Bartels, J., Heck, N.H. & Johnston, HF. (1939). The three-hour range index measuring geomagnetic activity. ''Geophysical Research'', ''44'', 411–454 (c.f. ref 4 on p 417).〕 ==Calculation of ''K''-index== The ''K''-scale is quasi-logarithmic. The conversion table from maximum fluctuation ''R'' (in units of nanoteslas, nT) to ''K''-index, varies from observatory to observatory in such a way that the historical rate of occurrence of certain levels of ''K'' are about the same at all observatories. In practice this means that observatories at higher geomagnetic latitude require higher levels of fluctuation for a given ''K''-index. For example, at Godhavn, Greenland, a value of ''K'' = 9 is derived with ''R'' = 1500 nT, while in Honolulu, Hawaii, a fluctuation of only 300 nT is recorded as ''K'' = 9. In Kiel, Germany, ''K'' = 9 corresponds to ''R'' = 500 nT or greater.〔 The real-time ''K''-index is determined after the end of prescribed intervals of 3 hours each: 00:00–03:00, 03:00–06:00, ..., 21:00–24:00. The maximum positive and negative deviations during the 3 hour period are added together to determine the total maximum fluctuation. These maximum deviations may occur any time during the 3 hour period. 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「K-index」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.