: Paléoclimatologie: cosmic ray

physical phenomenon > radiation > cosmic ray

cosmic ray

Cosmic rays are high-energy protons and atomic nuclei that move through space at nearly the speed of light. They originate from the Sun, from outside of the Solar System in our own galaxy, and from distant galaxies. Upon impact with Earth's atmosphere, cosmic rays produce showers of secondary particles, some of which reach the surface; although the bulk is intercepted by the magnetosphere or the heliosphere. Particle detectors similar to those used in nuclear and high-energy physics are used on satellites and space probes for research into cosmic rays. High-energy cosmic rays, like electromagnetic rays, are a unique source of information on phenomena of galactic and extragalactic origin. But its characteristics (energy, rarity) make precise observations difficult. Moreover, the important interactions with the galactic and extragalactic environment complicate the interpretation of the data collected in order to determine its source and nature. (Adapted from: https://en.wikipedia.org/wiki/Cosmic_ray and translated from: https://fr.wikipedia.org/wiki/Rayonnement_cosmique)

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