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magnetic north 磁北。

magnetic permeability

The two sunspots of a pair have different polarities , one would be a magnetic north and the other is a magnetic south . thus , we believe that there are magnetic field lines joining the two sunspots of a pair . the strong magnetic field locks the gas of the photosphere in places and inhibits the hotter gas below to rise at the sunspots 黑子經常成雙成對出現,每對皆由極性相反的黑子組成,若一個為磁北,另一個必為磁南,由此我們估計每對黑子皆由磁力線所連系,強大的磁場牽制著光球層上的氣體,并阻止了下層較熾熱的氣體上升至黑子范圍,結果黑子比太陽表面其他地方溫度較低。

Leslie dang , da liang and thomas carrier are taking part in the 2008 polar challenge . a 500km ski race to the magnetic north pole 戴絲莉,大梁和高凱利參加“ 2008極地挑戰” .這是在北極舉行的團體賽事,選手們要跋涉350英里到達1996年勘定的地磁北極。

Driven by propellers , microhunters navigate in three dimensions by homing in on light sources , depth , pressure or a direction ? magnetic north , for example 小獵人便以螺旋槳推動,在三度空間都可利用光源、深度、壓力、地磁作為方向的引導。

For starters , the core ' s motion could help explain why magnetic north and south periodically wander or reverse over earth ' s history 就像起動器一樣,地核的運動有助于解釋南北磁極周期性變換或歷史上地球磁極的翻轉原因。

The magnetic north and south poles have shifted before in the course of the planet ' s history - one result being the last ice age 在地球的歷史進程中地磁北極和磁南極已經轉換過-一種結果就是最后的冰河時期。

In fact , the difference between the directions of celestial and magnetic north depends on the position of the observer 天球的北和指南針所指示的磁北并不相同。而且其夾角會因地點不同而相異。

In 1988 , at the age of 50 , she became the first woman to travel alone to the magnetic north pole 一九八八年,她以五十歲之齡,成為全球第一位只身走訪磁北極的女性。

Normally it points toward magnetic north 正常地它指向磁北極。

It ' s where we get our magnetic north pole and south pole , 正因如此才形成了磁場的南北極