With the advent of the space age, say Campbell (solar-terrestrial physics, National Oceanic and Atmospheric Administration), the study of the planet's magnetic field has become so scientific that the general public seems to have been excluded from many of the developments. He seeks to remedy the situation by substituting explanations for mathematics. He covers the history and basic science, impacts and applications in daily lives, the deep-Earth source, the impact of the Sun, and questions and answers. He includes many line drawings and charts, and eight color plates.
