Chapman Region
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Chapman Region
A hypothetical region in the upper
atmosphere in which the distribution of electron density with height can
be described by a theoretical equation derived by Sydney Chapman.
Some of the basic assumptions used to develop the equation were that
the ionizing radiation from the sun is essentially monochromatic, that the
ionized constituent is distributed exponentially (with a constant scale
height), and that there is an equilibrium condition between the creation
of free electrons and their loss by recombination.
References
This article is based on NASA's Dictionary of Technical Terms for Aerospace Use