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