Chapmann Layer
This simulation calculate the ion production rate calculated by Chapman.
This follows the verison in Chapter 5 of "Theory of Planetary
Atmospheres" by Chamberlain and Hunten, Academic Press (1978).
The simulation allows the user to adjust parameters that enter into the
scale height and the EUV flux. Based on these inputs it plots the
(single species) Neutral Density and the ion production rate against the
altitude.