The Earth's Atmosphere - The region extending above about 60 km
to beyond 1000 km altitude, where the concentration of ions is
large enough to influence radio propagation. It is divided into
several regions: D (60 to 100 km), E (100 to 150 km), F (150 to
1000 km). The F region is further divided into F1 and F2
regions, with F2 blending into the magnetosphere. - Broadly
defined, this is the region the motion of charged particles is
controlled by the geomagnetic field. However, this definition
includes most of the ionosphere, and common usage places the
magnetosphere's lower boundary around the F2 ionosphere region.
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