Geomagnetic Micropulsations

1 The Earth's Magnetic Field.- 1.1 Introduction.- 1.2 Transient Magnetic Variations.- 1.3 The Magnetosphere.- 1.4 Conjugacy.- References.- 2 The Morphology of Geomagnetic Micropulsations.- 2.1 Introduction.- 2.2 Classification of Micropulsations.- 2.3 Continuous Pulsations (Pc 1).- 2.4 Continuous Pulsations (Pc 2/3, Pc 4, and Pc 5).- 2.4.1 Continuous Pc 2/3 Oscillations.- 2.4.2 Continuous Pc 4 Oscillations.- 2.4.3 Continuous Pc 5 Oscillations.- 2.5 Pulsations with Irregular Forms.- 2.5.1 Irregular Pulsations Pi 1.- 2.5.2 Irregular Pulsations Pi 2.- 2.5.3 Other Forms of Pi Activity.- References.- 3 Magneto-Hydrodynamic Waves.- 3.1 Alfvén Waves.- 3.2 The Equations of Small Hydromagnetic Oscillations.- 3.3 The Dispersion Relation.- 3.4 Theories of Pc Oscillations.- 3.5 Transmission of Hydromagnetic Waves Through the Ionosphere and Magnetosphere.- References.- 4 Theories of the Origin of Pc 1 Pulsations.- 4.1 Introduction.- 4.2 The Structure of the Frequency Spectrum of Pc 1's.- 4.3 The Cyclotron Instability Process and the Generation of Pc 1's.- 4.4 Sub Classes of Pc 1's-Non Linear Theories.- 4.5 Propagation of Pc 1's to Lower Latitudes.- References.- 5 Theories of Pc 2-5 and Pi Oscillations.- 5.1 Introduction.- 5.2 Toroidal Oscillations.- 5.3 The Excitation Mechanism of Pc 5's.- 5.4 Theories of Pi's.- References.- 6 Micropulsations and the Diagnostics of the Magnetosphere.- 6.1 Introduction.- 6.2 Relationship Between Micropulsations, The Solar Wind and the Dimensions of the Magnetosphere.- 6.3 Plasma Densities in the Magnetosphere Determined from Micropulsation Measurements.- 6.4 Micropulsations Observed in the Magnetosphere.- References.