1. INTRODUCTION

2. ATTENUATION BY THE ATMOSPHERE AT OPTICAL WAVELENGTHS, AND ITS VARIABILITY

3. THE ANGULAR AND TEMPORAL CORRELATION FUNCTIONS OF ATMOSPHERIC TRANSMISSION

4. SPECTROSCOPIC MEASUREMENTS OF ATMOSPHERIC TRANSMISSION

5. PHOTOMETRIC MEASUREMENTS OF ATMOSPHERIC TRANSMISSION

6. ACTIVE INTERROGATION OF THE ATMOSPHERE: LIDAR

7. MODELING THE TRANSMISSION OF THE ATMOSPHERE: MODTRAN

8. SUMMARY AND NEXT STEPS