An Etymological Dictionary of Astronomy and Astrophysics

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فرهنگ ریشه‌شناختی اخترشناسی-اخترفیزیک

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polar cap
  کلاهک ِ قطبی  
kolâhak-e qotbi
Fr.: calotte polaire  

  1. Either of the regions around the poles of the Earth that are permanently covered with ice.

  2. Either of the two regions around the poles of the planet Mars, consisting of frozen carbon dioxide and water ice.

  3. An area of a → pulsar’s surface from where open magnetic field lines emanate.

See also: → polar; → cap.