Originally published in 1958, this informative textbook was primarily designed for undergraduate students and presents a classical account of cosmic electrodynamics, as well as addressing the rapid changes and growth in the field and discussing the new and emerging developments at the time of publication. Detailed, clearly written and replete with equations and diagrams, this book systematically includes a section on each major topic and explains both the physics of the subject as well as the mathematics necessary for a thorough and full understanding. Multiple topics and sub topics are considered and analysed, including the velocity-distribution method, magnetic storms and ionospheric electrodynamics. This book captures the very dynamism and vibrancy of the subject and goes into much greater detail than most physics textbooks at the time. It will be of significant value to scholars of astrophysics as well as to anyone with an interest in the history of education.