Radiation originating directly or indirectly from extraterrestrial sources. Cosmic radiation is part of natural radiation and its dose depends on the altitude above sea level. At sea level it amounts [..]

A source of natural background radiation, which originates in outer space and is composed of penetrating ionizing radiation (both particulate and electromagnetic). The sun and stars send a constant stream of cosmic radiation to Earth, much like a steady drizzle of rain. Differences in elevation, atmospheric conditions, and the Earth's magnetic [..]

radiation produced in outer space when heavy particles (nuclei of all known natural elements) bombard the earth. See also background radiation, terrestrial radiation.

Penetrating ionizing radiation, both particulate and electromagnetic, that originates in outer space. Secondary cosmic rays, formed by interactions in the earth's atmosphere, account for about 45 [..]

High-energy Radiation or particles from extraterrestrial space that Strike the earth, its Atmosphere, or Spacecraft and may create secondary Radiation as a result of collisions with the Atmosphere or [..]

High-energy radiation or particles from extraterrestrial space that strike the earth, its atmosphere, or spacecraft and may create secondary radiation as a result of collisions with the atmosphere or [..]

Cosmic radiation is penetrating ionizing radiation comprised of particles and electromagnetic energy that comes from outer space. Cosmic radiation accounts for about half of the natural background rad [..]