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

فرهنگ ریشه شناختی اخترشناسی-اخترفیزیک

M. Heydari-Malayeri    -    Paris Observatory

   Homepage   
   


A B C D E F G H I J K L M N O P Q R S T U V W X Y Z

Number of Results: 8 Search : aurora
aurora
  اوشه   
ušé

Fr.: aurore   

A phenomenon consisting of luminous colorful arcs, rays, and streamers that appear in the Earth's upper atmosphere during the night with the greatest frequency in the northern and southern polar magnetic zones. This → non-thermal radiation is caused by the emission of light from atoms excited by electrons accelerated along the planet's magnetic field lines at the magnetic poles. Fluorescent emission from atomic oxygen at 5557 Å results in a greenish glow, and there is a weaker effect from the red line at 6300 Å. Blue and purple colors are emitted by atomic and molecular nitrogen.

L. Aurora, the Roman goddess of dawn, akin to Av. uš-, ušah- "dawn," Skt. usas-, usah- "dawn," Gk. eos "dawn," Lith. ausra "dawn," O.E. east "east," PIE *ausus- "dawn," from *aus- "to shine."

Ušé, from Av. uš-, ušah-, as above.

aurora australis
  اوشه‌ی ِ دشتری   
uše-ye daštari

Fr.: aurore australe   

The aurora in the Southern hemisphere, also called as Southern Lights.

aurora; → south.

aurora borealis
  اوشه‌ی ِ هودری   
uše-ye hudari

Fr.: aurore boréale   

The aurora in the Northern hemisphere, also called as Northern Lights.

aurora; → north.

auroral
  اوشه‌ای   
uše-yi

Fr.: auroral   

Pertaining to the → aurora phenomenon.

aurora; → -al.

auroral emission
  گسیل ِ اوشه‌ای   
gosil-e uše-yi

Fr.: émission aurorale   

The → electromagnetic radiation emitted in planetary atmospheres involving the → aurora phenomenon.

auroral; → emission.

auroral line
  خط ِ اوشه‌ای   
xatt-e uše-yi

Fr.: raie aurorale   

1) A prominent → forbidden line in the spectra of the aurora at wavelengths of 5577 and 6300 Å giving the aurora its characteristic green and red colors. Both are emitted by atomic oxygen, the former in its transition from the second lowest excited electronic state (1S) to the lowest excited electronic state (1D), the latter in its transition from the lowest excited electronic state (1D) to the atomic ground state (3P).
2) A forbidden line emitted by interstellar ionized gas by several atomic species (O, O+, O++, N+, S++, etc.) corresponding to the transition from the state 1S to 1D. → forbidden line; → nebular line; → transauroral line.

auroral; → line.

auroral zone
  زنار ِ اوشه‌ای   
zonâr-e uše-yi

Fr.: zone aurorale   

A roughly circular band around either geomagnetic pole above which there is a maximum of auroral activity. It lies about 10 to 15° of geomagnetic latitude from the geomagnetic poles.

auroral; → zone.

transauroral line
  خط ِ ترا-اوشه‌ای   
xatt-e tarâ-uše-yi

Fr.: raie transaurorale   

A forbidden line emitted by interstellar ionized gas by several atomic species (O, O+, O++, N+, S++, etc.) corresponding to the transition from the electronic state 1S to 3P. Examples are the ultraviolet line of the doubly ionized oxygen [O III] at 2321 A and [N II] 3063 A. → auroral line; → forbidden line; → nebular line.

trans-; → auroral line.