Analysis of the physics and phenomena of the ionosphere for graduates, ionospheric physicists and radio engineers.A modern treatment of the physics and phenomena of the high latitude upper atmosphere, important for its role in supporting communications applications. Chapters cover the basics of radio propagation and the use of radio techniques in ionospheric studies. It contains examples and data not previously published outside Conference Proceedings and organizational reports. Ample cross-referencing, chapter summaries and reference lists make this book an invaluable aid for graduate students, ionospheric physicsts and radio engineers, as well as those interested in 'space weather', the aurora and other high latitude atmospheric anomalies.A modern treatment of the physics and phenomena of the high latitude upper atmosphere, important for its role in supporting communications applications. Chapters cover the basics of radio propagation and the use of radio techniques in ionospheric studies. It contains examples and data not previously published outside Conference Proceedings and organizational reports. Ample cross-referencing, chapter summaries and reference lists make this book an invaluable aid for graduate students, ionospheric physicsts and radio engineers, as well as those interested in 'space weather', the aurora and other high latitude atmospheric anomalies.This book presents a modern treatment of the physics and phenomena of the high latitude upper atmosphere and the morphology of radio propagation in the auroral and polar regions. Chapters cover the basics of radio propagation and the use of radio techniques in ionospheric studies. Many investigations of high latitude radio propagation have previously only been published in Conference Proceedings and organizational reports. This book also includes many examples of the behavior of quiet and disturbed high latitude HF propagation.Preface; 1. Basic principles of the ionosphere; 2. Geophysical phenomena influlsĒ