Front Cover; Advances in Electronics and Electron Physics, Volume IX; Copyright Page; Contents; Contributors to Volumes IX; Preface; Chapter 1. Aurora Borealis; I. Introduction; II. General Description of Auroras; III. Radio Studies of Aurora; IV. Spectroscopy; V. Rocket Observations; References; Chapter 2. Negative Ions; I. Introduction; II. Properties of Atomic Negative Ions; III. Properties of Molecular Negative Ions; IV. Negative-Ion Collisions with Heavy Particles; V. Negative Ions in the Upper Atmosphere; References; Chapter 3. Radio Observation of Meteors; I. Introduction

II. Radio TechniquesIII. Radio Contributions to Meteor Astronomy; IV. Some Geophysical Observations on Meteor Trails; References; Chapter 4. Intensity Variations in Cosmic Rays; I. Introduction; II. Penetration of Cosmic Rays into the Atmosphere; III. Meteorological Effects; IV. The Geomagnetic Latitude Variation; V. Periodic Variations in Intensity; VI. Sudden Changes in Intensity; VII. Source Theories of Cosmic Rays; References; Chapter 5. Radio-Wave Propagation: A Review; I. Introduction; II. The Velocity of Light and Radio Waves in a Vacuum; III. Low-Frequency Ground-Wave Propagation

IV. Propagation of High-Frequency WavesReferences; Chapter 6. Electronics in Oceanography; I. Introduction; II. Basic Measurements; III. Ocean Currents; IV. Ocean Wave Measurements; V. Marine Seismography and Underwater Sound; References; Chapter 7. Contributions of Electronics to Seismology and Geomagnetism; I. Introduction; II. Applications to General Seismology; III. Applications to Seismic Prospecting; IV. A Contribution to Geomagnetic Measurements-the Nuclear Precession Magnetometer; References; Author Index; Subject Index