Difference between revisions of "Cosmic rays"

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<div class="definition"><div class="short_definition">(<br/>''Or'' [[cosmic radiation]].) Without qualification, usually means the primary cosmic rays  of extra-terrestrial origin that continually bombard the earth and consist mostly of high-energy  [[protons]], about 9% [[helium]] and heavier nuclei, a small percentage of [[electrons]], and some [[gamma  rays]].</div><br/> <div class="paragraph">The energies of cosmic rays are well in excess of billions of [[electron volts]]. Secondary cosmic  rays result from interactions between primary rays and atoms in the earth's [[atmosphere]]. Most  cosmic rays probably originate from the Milky Way galaxy, but a small fraction come from the  sun as evidenced by [[diurnal]] variations in the cosmic ray flux.</div><br/> </div><div class="reference">Boorse, H. A., and L. Motz 1966. The World of the Atom. Vol. I, . 669&ndash;675. </div><br/> <div class="reference">Friedlander, M. W. 1989. Cosmic Rays. pp. 13, 79. </div><br/>  
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<div class="definition"><div class="short_definition">(''Or'' [[cosmic radiation]].) Without qualification, usually means the primary cosmic rays  of extra-terrestrial origin that continually bombard the earth and consist mostly of high-energy  [[protons]], about 9% [[helium]] and heavier nuclei, a small percentage of [[electrons]], and some [[gamma  rays]].</div><br/> <div class="paragraph">The energies of cosmic rays are well in excess of billions of [[electron volts]]. Secondary cosmic  rays result from interactions between primary rays and atoms in the earth's [[atmosphere]]. Most  cosmic rays probably originate from the Milky Way galaxy, but a small fraction come from the  sun as evidenced by [[diurnal]] variations in the cosmic ray flux.</div><br/> </div><div class="reference">Boorse, H. A., and L. Motz 1966. The World of the Atom. Vol. I, . 669&ndash;675. </div><br/> <div class="reference">Friedlander, M. W. 1989. Cosmic Rays. pp. 13, 79. </div><br/>  
 
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Latest revision as of 13:59, 20 February 2012



cosmic rays

(Or cosmic radiation.) Without qualification, usually means the primary cosmic rays of extra-terrestrial origin that continually bombard the earth and consist mostly of high-energy protons, about 9% helium and heavier nuclei, a small percentage of electrons, and some gamma rays.

The energies of cosmic rays are well in excess of billions of electron volts. Secondary cosmic rays result from interactions between primary rays and atoms in the earth's atmosphere. Most cosmic rays probably originate from the Milky Way galaxy, but a small fraction come from the sun as evidenced by diurnal variations in the cosmic ray flux.

Boorse, H. A., and L. Motz 1966. The World of the Atom. Vol. I, . 669–675.

Friedlander, M. W. 1989. Cosmic Rays. pp. 13, 79.


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