An Etymological Dictionary of Astronomy and Astrophysics
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فرهنگ ریشه شناختی اخترشناسی-اخترفیزیک

M. Heydari-Malayeri    -    Paris Observatory

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Number of Results: 4 Search : polarity
polarity
  قطبیگی   
qotbigi

Fr.: polarité   

1) Physics: The condition, in a system, of having opposite characteristics at different points, especially positive or negative with respect to electric charge or magnetic properties.
2) Chemistry: A property of a molecule caused by unsymmetrical charge distribution.

From → polar + → -ity.

polarity epoch
  زیمه‌ی ِ قطبیگی   
zime-ye qotbigi

Fr.: époque de polarité   

The time during which the Earth's magnetic field was of a single polarity; an interval of time between reversals of Earth's magnetic field.

polarity; → epoch.

polarity event
  رویداد ِ قطبیگی   
ruydâd-e qotbigi

Fr.: événement de polarité   

A specific event in the history of Earth's magnetic field. Usually used in reference to a specific → polarity reversal.

polarity; → event.

polarity reversal
  وارونش ِ قطبیگی، واگردانی ِ ~   
v âruneš-e qotbigi, vâgardâni-ye ~

Fr.: inversion de polarité   

1) A change in the → polarity of Earth's magnetic field in which the north magnetic pole becomes the south magnetic pole and vice versa. Also known as geomagnetic reversal or magnetic reversal. Earth's magnetic field has reversed many times in the past and the time intervals between these changes are known as → polarity epochs.
2) The change in the polarity of the → solar magnetic field with the ending of each → solar activity cycle so that the North magnetic pole becomes the South and vice versa.

polarity; → reversal.