An Etymological Dictionary of Astronomy and Astrophysics
English-French-Persian

فرهنگ ریشه شناختی اخترشناسی-اخترفیزیک

M. Heydari-Malayeri    -    Paris Observatory

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Number of Results: 3 Search : north pole
geographic north pole
  قطب ِ هودر ِ زمین‌نگاریک   
qotb-e hudar-e zaminnegârik

Fr.: pôle nord géographique   

north pole.

geographic; → north; → pole.

magnetic north pole
  قطب ِ هودر ِ مغناتیسی   
qotab-e hudar-e meqnâtisi

Fr.: pôle nord magnétique   

A point of the → magnetosphere where the Earth's → magnetic field points vertically downward; in other words it has a 90° → magnetic dip toward the Earth's surface. The magnetic north pole can also be defined as the point toward which the south pole of the → compass needle is directed. The magnetic north pole is different from the → geographic north pole. It is actually hundreds of kilometers south of the geographic north pole. However, this has not always been the case. In the past 150 years it has moved more than 1,000 kilometers. Every 200,000 to 300,000 years the magnetic field of the Earth reverses direction, → magnetic reversal. Since the Earth's magnetic field is not exactly symmetrical, the north and south magnetic poles are not → antipodal.

magnetic; → north; → pole.

north pole
  قطب ِ هودر   
qotb-e hudar

Fr.: pôle nord   

1) An → imaginary → point in the → northern hemisphere representing the intersection of the → Earth's → rotation axis with the → globe or with the → celestial sphere.
2) For a → magnet, the pole which points toward the geographic north.
3) In a → magnetic field, the point from where a → line of force is leaves for the → south pole.

north; → pole.