Contents:

Abstract

Chapter 1 ..... Introduction

Chapter 2 ..... The Nature of the Iris Data Set

Chapter 3 ..... Pointing Accuracy and Terrain Classification

Chapter 4 ..... The Shape of the Iris Spectra

Chapter 5 ..... Global Temperature Distributions

Chapter 6 ..... Surface Roughness as a Possible Explanation of Spectrum Shapes

Chapter 7 ..... Modelling of Diurnal Temperature Variations

Chapter 8 ..... Thermal Ice Segregation

Chapter 9 ..... Competing Ice Transport Processes

Chapter10 ..... Spectroscopic Evidence for Ice Distribution and Abundance

Chapter11 ..... Indirect Evidence for Segregation,and Implications

Chapter12 ..... Conclusions

Appendix A : Anisotropy of Thermal Emission

Appendix B : Details of the Topographic Temperature Models

Appendix C : Details of the Thermophysical Models

Appendix D : Calculation of Ion Sputtering Rates

Appendix E : Ice absorption and Band Depths in Segregated Surface Spectra

Appendix F : The Iris Data

Glossary

List of References

Table X. ..... The Voyager 2 Europa IRIS Spectra

Table XI...... The Voyager 1 Ganymede IRIS Spectra

Table XII..... The Voyager 2 Ganymede IRIS Spectra

Table XIII.... The Voyager 1 Callisto IRIS Spectra

Table XIV.... The Voyager 2 Callisto IRIS Spectra