This book is an introductory textbook on the physical processes
occurring in the Earth's radiation belts. The presentation is at the
advanced undergraduate or first year graduate level, and it is
appropriate for students who intend to work in some aspect of
magnetospheric physics. The treatment is quantitative and provides the
mathematical basis for original work in this subject. The equations
describing the motion of energetic ions and electrons in the geomagnetic
field are derived from basic principles, and concepts such as magnetic
field representations, guiding centre motion, adiabatic invariance, and
particle distribution functions are presented in a detailed and
accessible manner. Relevant experimental techniques are reviewed and a
summary is given of the intensity and energy spectra of the particle
populations in the Earth's radiation belts. Problem sets are included as
well as appendices of tables, graphs and frequently used formulas.