Mar 2013, American Geophysical Union
Published by the American Geophysical Union as part of the Antarctic Research Series, Volume 64.
Archdeacon Stuck was seeing halos formed in moonlight. Their daytime counterparts are surprisingly common, not only in the arctic but in temperate climates as well. Many halos are possible, forming arcs of colored or white light almost anywhere in the sky. Their occasional brilliance, variety, and exotic shapes have impressed skywatchers for centuries.
This book introduces halos and tries to convey some of their beauty. It tells much of what is known about them: how they arise, how so many are possible, and why some are rare, while others occur every few days or so. No such insights, of course, are necessary for the enjoyment of a halo display; indeed, an elaborate display is one of Nature's wonders. Nevertheless, understanding can add to enjoyment, especially since the makings of a great display turn out to be as remarkable as the display itself.
Chapter 1. Halos From Plate Crystals 1
Chapter 2. Halos From Column Crystals 13
Chapter 3. Halos From Parry Oriented Crystals 29
Chapter 4. The 220 and 460 Halos 45
Chapter 5. Why Are the Rare Halos Rare? 53
Chapter 6. The Role of Sun Elevation 58
Chapter 7. Subhorizon Halos 69
Chapter 8. Cold Weather Halos 77
Chapter 9. Organizing the Halos 78
Chapter 10. Pyramidal Crystals and Odd Radius Circular Halos 82
Chapter 11. Hevel's Halo and Other Mysteries 95
AppendixA . Suggestionfs or PhotographinHg Halos 105
Appendix B. Some History 106
Appendix C. Halo Simulations at Selected Sun Elevations 108
Appendix D. Ice Crystal Habit 122
Appendix E. Ray Paths for Halos 123
Appendix F. The Halo Simulation Program 132
Appendix G. Parameters of the Halo Simulations 134
Further Reading 138