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: 5 Search : cosmic ray
cosmic rays
  پرتوهای ِ کیهانی   
partowhâ-ye keyhâni (#)

Fr.: rayons cosmiques   

Extremely energetic atomic nuclei, mostly protons, which travel through the Universe at practically the speed of light and strike the Earth from all direction. Their energy ranges from 109 to 1020 electron-volts.

cosmic; → ray.

high-energy cosmic rays
  پرتوهای ِ کیهانی ِ مه‌کاروژ، ~ ~ پرکاروژ   
partowhâ-ye keyhâni-ye meh-kâruž, ~ ~ por-kâruž

Fr.: rayons cosmiques de hautes énergies   

Cosmic rays which typically have energies in the range 1015 to 1020 electron volts. For the most part, they are protons and other atomic nuclei, and come from distant cosmos, perhaps even from outside our own Galaxy.

high; → energy; → cosmic; → ray.

primary cosmic rays
  پرتوهای ِ کیهانی ِ نخستان   
partowhâ-ye keyhâni-ye noxostân

Fr.: rayons cosmiques primaires   

High energy charged particles that arrive at Earth's upper atmosphere from outer space. Primary cosmic rays generally do not make it through the atmosphere to reach at the Earth's surface, in contrast to → secondary cosmic rays.

primary; → cosmic; → ray.

secondary cosmic rays
  پرتوهای ِ کیهانی ِ دومان   
partowhâ-ye keyhâni-ye dovomân

Fr.: rayons cosmiques secondaires   

Atomic fragments - mainly muons - produced by collisions between primary cosmic rays and the molecules in Earth's atmosphere.

secondary; → cosmic rays.

ultra-high-energy cosmic ray (UHECR)
  پرتوهای ِ کیهانی ِ اولتر-مه-کاروژ   
partowhâ-ye keyhâni-ye ultar-meh-kâruž

Fr.: rayons cosmiques de très haute énergie   

A particle belonging to the most energetic population of → cosmic rays with an energy above ~ 1020 → electron-volts. The UHECRs constitute a real challenge for theoretical models, because their acceleration requires extreme conditions hardly fulfilled by known astrophysical objects. See also → UHECR puzzle, → Greisen-Zatsepin-Kuzmin cutoff.

ultra- + → high-energy cosmic ray.