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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 International Geomagnetic Reference Field ： ウィキペディア英語版 International Geomagnetic Reference Field The International Geomagnetic Reference Field (IGRF) is a standard mathematical description of the Earth's main magnetic field and its secular variation. It is the product of a collaborative effort between magnetic field modellers and the institutes involved in collecting and disseminating magnetic field data from satellites and from observatories and surveys around the world. == Spherical Harmonics == Mathematically, the IGRF model consists of the Gauss coefficients which define a spherical harmonic expansion of the magnetic scalar potential. $$ V(r,\phi,\theta) = a \sum_^L\sum_^\ell \left(\frac\right)^ \left(g_\ell^m\cos m\phi + h_\ell^m\sin m\phi\right) P_\ell^m\left(\cos\theta\right) where $r$ is radial distance from the Earth's center, $L$ is the maximum degree of the expansion, $\backslash phi$ is East longitude, $\backslash theta$ is colatitude (the polar angle), $a$ is the Earth's radius, $g\_\backslash ell^m$ and $h\_\backslash ell^m$ are Gauss coefficients, and $P\_\backslash ell^m\backslash left(\backslash cos\backslash theta\backslash right)$ are the Schmidt normalized associated Legendre functions of degree $l$ and order $m$. IGRF models are standardized for a particular year, reflecting the most accurate measurements available at that time, and indicating a small-scale, slow time variation of the Earth's overall magnetic field. 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「International Geomagnetic Reference Field」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.