Front Cover; Advances in Geophysics, Volume 5; Copyright Page; Contents; List of Contributers; Foreword; Chapter 1. From Polar Years to IGY; 1. History; 2. The First International Polar Year; 3. The Second International Polar Year; 4. The International Geophysical Year; 5. The International Years in Retrospect; 6. Future of the International Years; References; Chapter 2. Microseisms; 1. Introduction; 2. Instruments for the Investigation of Microseisms; 3. Microseisms Produced by Artificial Causes; 4. Natural Microseisms with Periods of Less Than Two Seconds.

5. Regular Microseisms with Periods of One to Three Seconds6. Microseisms with Periods of About Four Seconds; 7.""The"" Regular Microseisms with Periods from Four to Ten Seconds; 8. Microseisms with Periods of Ten Seconds to Several Minutes; 9. Theory; List of Symbols; References; Chapter 3. The Size and Shape of the Earth; 1. Introduction; 2. Triangulation; 3. Astronomical Coordinates; 4. Spirit Leveling; 5. Gravity Measurements; List of Symbols; References; Chapter 4. Oceanic Tides; 1. Introduction and General Remarks; 2. Tidal Charts Obtained by Empirical Methods.

3. Mathematical Investigation for Oceans Encircling the Earth4. Mathematical Investigation for Oceans Bounded by Meridians; 5. Mathematical Methods Applied to Actual Oceans; 6. Future Research; List of Symbols; References; Chapter 5. Ultraviolet Absorption Process in the Upper Atmosphere; 1. Introduction.; 2. Density, Temperature, and Composition of the Upper Atmosphere; 3. Solar Ultraviolet and X-Rays; 4. Absorption Cross-Sections of Atmospheric Gases; 5. Some Atmospheric Absorption Processes; Acknowledgments.; List of Symbols; References; Chapter 6. The Physics of Cloud Modification.

1. Introduction2. Clouds and the Atmospheric Water Vapor Cycle; 3. Present Status of Cloud and Precipitation Physics; 4. Recent Developments in Cloud-Modification Techniques; 5. The Evaluation of Modification Experiments; 6. Concluding Remarks; Acknowledgment; References; Author Index; Subject Index; Cumulative Title Index, Volumes I-IV; Cumulative Subject Index, Volumes I-IV.