Front Cover; Electromagnetism and the Earth's Interior; Copyright Page; PREFACE; Table of Contents; CHAPTER 1. INTRODUCTORY REMARKS; CHAPTER 2. MAIN MAGNETIC FIELD OF THE EARTH; World's distribution of the geomagnetic field; Spherical harmonic analysis of the main field; Dipole field; Eccentric dipole; CHAPTER 3. THEORY OF STEADY DYNAMO; Theories of the origin of the earth's magnetism; Basic idea of the dynamo; Equations for a homogeneous dynamo; Physical discussions relating to the homogeneous dynamo; Convection current and magnetic lines of force; Bullard process; Inglis model

Backus and Herzenberg dynamosLowes and Wilkinson's experiment; CHAPTER 4. STABILITY OF THE DIPOLE FIELD; Fundamental equations for small M.H.D. disturbances given to a conducting fluid body; M.H.D. oscillation of a perfectly conducting fluid sphere placed in a uniform magnetic field; Effect of the Coriolis force; Stability of the earth's dynamo; CHAPTER 5. THEORY OF NON-STEADY DYNAMO; Finite-amplitude oscillation of a disk dynamo; Oscillation of a system of disk dynamo; Disk dynamo with a heat engine; Time-dependent behaviour of the Inglis model; CHAPTER 6. GEOMAGNETIC SECULAR VARIATION

Secular variation as observed by instrumentsAnalysis of the secular variation; Decrease in the dipole moment; Secular variation during historical and geological times; Reversal of the geomagnetic dipole; Westward drift of the geomagnetic field; Non-drifting secular variation; Drift of the eccentric dipole; Fluctuation in the length of day and geomagnetic secular variation; CHAPTER 7. THEORY OF SECULAR VARIATION; Core-mantle coupling and the westward drift; Time-dependent core-mantle coupling; Oscillation of the quadrupole field in relation to the northward shift

Growth and decay of non-drifting fieldCHAPTER 8. ELECTROMAGNETIC INDUCTION WITHIN THE EARTH BY DAILY VARIATION; Analysis of solar daily variation (Sq); Analysis of lunar daily variation (L); Numerical method for calculating a magnetic potential; Surface integral method for the analysis of a potential; CHAPTER 9. THEORY OF ELECTROMAGNETIC INDUCTION IN A SPHERICAL BODY; Fundamental equations in a non-uniform conductor; Conductors with spherical symmetry; Use of high-speed computer; CHAPTER 10. ELECTROMAGNETIC INDUCTION BY VARIOUS VARIATIONS; Sudden storm commencement (s.s.c.)

Storm main phase (Dst)Geomagnetic bay; Solar flare effect (s.f.e.); Auroral jet; Other variations; CHAPTER 11. THEORY OF ELECTROMAGNETIC INDUCTION IN AN EARTH HAVING A PLANE SURFACE; Fundamental equations; Elementary solutions; Indeterminate case for induction by a uniform field; Relation between external and internal parts of the geomagnetic field over a plane earth; Line of magnetic dipoles over a uniform earth-a two-dimensional problem; CHAPTER 12. THEORY OF ELECTROMAGNETIC INDUCTION IN A THIN SHEET OF CONDUCTOR; General equations; Plane sheet; Spherical sheet; Hemispherical sheet