#ionosphere  the outer region of the Earth's atmosphere; contains a high concentration of free electrons
  supertype:  region.location__part  the extended spatial location of something; "the farming regions of France"; "religions in all parts of the world"; "regions of outer space"
  part:  D-layer  Appleton_layer  Kennelly-Heaviside_layer
  part of:  atmosphere  the mass of air surrounding the Earth; "there was great heat as the comet entered the atmosphere"
     part of:  Earth.terrestrial_planet__earth__globe  the 3rd planet from the sun; the planet on which we live; "the Earth moves around the sun"; "he sailed around the world"

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