Excerpt from Conference on Non-Linear Processes in the Ionosphere, December 16-17, 1963Several different processes contribute to ionization in the normal D-region (50-85 km). Above 70 km ionization of NO by'lymanwa appears to predomi nate. Below about 70 km cosmic-ray ionization of air begins to'become important and below 60 km ionization by kav'x-rays ()l l R) and cosmic rays predominates.About the PublisherForgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.comThis book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully, any imperfections that remain are intentionally left to preserve the state of such historical works.