Primary Cosmic Rays

Some articles on primary cosmic rays, cosmic rays:

Cosmic Rays - History - Researching The Particle Energy
... of the energy and arrival directions of the ultra-high energy primary cosmic rays by the techniques of "density sampling" and "fast timing" of extensive air showers were first carried out in 1954 by members of the ... experiments carried out all over the world, the energy spectrum of the primary cosmic rays is now known to extend beyond 1020 eV ... Their aim is to explore the properties and arrival directions of the very highest energy primary cosmic rays ...
Primary Cosmic Rays
... Primary cosmic rays originate mainly outside the Solar system, i ... Almost 90% of primary cosmic rays are protons, about 9% are helium nuclei (alpha particles) and nearly 1% are electrons ... These light nuclei appear in cosmic rays in much greater abundance (~1%) than in the solar atmosphere, where their abundance is about 10−9% that of helium ...

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