翻訳と辞書 Words near each other ・ Jansenella ・ Jansenia ・ Jansenism ・ Jansenville ・ Janseodes ・ Jansewa Ashram ・ Jansgeleen Castle ・ Jansha (crater) ・ Jansher Khan ・ Jansila Majeed ・ Jansin Turgut ・ Jansing and Company ・ Janskerk ・ Janskerk, Haarlem ・ Janski Beeeats ・ Jansky ・ Jansky (crater) ・ Jansky (disambiguation) ・ Jansky (surname) ・ Jansky–Bielschowsky disease ・ Janská ・ Janské Lázně ・ Jansma ・ Janson ・ Janson (Charleroi Metro) ・ Janson (disambiguation) ・ Janson (name) ・ Janson Design Group ・ Janson Media ・ Janson Wigo 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 Jansky ： ウィキペディア英語版 Jansky The jansky (symbol Jy) is a non-SI unit of spectral flux density,〔http://science.jrank.org/pages/57879/jansky.html 〕 or spectral irradiance, equivalent to 10−26 watts per square metre per hertz. The ''flux density'' or ''monochromatic flux'', $S$, of a source is the integral of the spectral radiance, $B$, over the source solid angle: $S\; =\; \backslash iint\_\backslash Omega$ The unit is named after pioneering US radio astronomer Karl Guthe Jansky, and is defined as: $1\; \backslash \; \backslash mathrm\; =\; 10^\; \backslash frac\; \}$ (SI) $=\; 10^\; \backslash frac\; \backslash cdot\; \backslash mathrm\; \backslash cdot\; \backslash mathrm\; \}$ (cgs)〔〕 Since the jansky is obtained by integrating over the whole source solid angle, it is most simply used to describe point sources; for example, the Third Cambridge Catalogue of Radio Sources (3C) reports results in Jy. * For extended sources, the surface brightness is often described with units of Jy per solid angle; for example, Far Infra-Red (FIR) maps from the IRAS satellite are in MJy/sr. * While extended sources at all wavelengths can be reported with these units, for radio frequency maps, extended sources have traditionally been described in terms of a brightness temperature; for example the (Haslam et al. ) 408 MHz all-sky continuum survey is reported in terms of a brightness temperature in K. ==Unit conversions== Jansky units are not a standard SI Unit, so it may be imperative to convert the unit to Watts. However, other unit conversions are possible with respect to measuring this unit. 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「Jansky」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.