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| The region beginning at the lower boundary of the Earth's ionosphere (approximately 50 km) and extending outward that contains solid particles (asteroids and meteoroids), energetic charged particles (ions, protons, electrons, etc.), and electromagnetic and ionizing radiation (x-rays, extreme ultraviolet, gamma rays, etc.). See also ionosphere. (JP 3-59)
Source: US DoD Joint Publication 1-02, DOD Dictionary of Military and Associated Terms (as amended through 9 June 2004). |
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