Abstract
The present paper continues the work on the ionization of the upper atmosphere due to the ultraviolet light of the sun, developed in a series of papers in this Journal, and takes into account as far as possible the entire meteorology of the upper atmosphere and the effects of recombination, temperature diffusion and the motions of the ions and electrons in the gravitational, electric and magnetic fields of the earth. Tables are presented of the ion and electron densities over the earth. The ionization at night is worked out more completely than was done previously. After sunset as a result of temperature diffusion and electric-magnetic drift, the ionized region separates into two banks, one with a maximum of ionization at about 110 km and one with a maximum at about 140 km. Quantitative agreement is found with the skip distances and other phenomena of wireless waves and with various facts of terrestrial magnetism.
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