This model is determined to accurately represent the geomagnetic field, and is given as Gaussian coefficients. Using these coefficients and a set formula, it is possible to calculate the magnetic field on Earth or in space near the Earth. As the geomagnetic field changes every year, a new model is decided at an international conference every five years, but there are slight differences between researchers, and there is constant debate over which model is the most accurate. [Yanagisawa Masahisa] Source: Heibonsha World Encyclopedia, 2nd Edition Information |
地球磁場を正確に表現するように決められたモデルで,ガウス係数として与えられている。この係数を用いて,決められた公式から,地球上あるいは地球近傍の宇宙空間での磁場を計算することができる。地球磁場は年々変化していくので,国際会議で5年に1回新しいものが決められるが,研究者ごとに少しずつ違いがあり,どのモデルがいちばん正確かが常に議論されている。【柳沢 正久】
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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