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- Wiley
More About This Title Atmospheric Halos and the Search for Angle x
English
Published by the American Geophysical Union as part of the Special Publications Series.
Atmospheric halos are visible phenomena of much beauty and fascination. From our earliest known records, dating from the Sumerian-Babylonian culture of 4-5,000 years ago, to modern researchers, halos have kept us looking skyward. Caused by light refracted through ice crystals floating in the atmosphere, they can appear at nearly any time and place. What do the ice crystals look like, especially those that make the exotic "odd radius" halos? What is the value of the elusive angle x, so critical to determining the shapes of these crystals? What halo displays do we understand well and what displays do we not understand at all?
This book responds to such questions, and more, with a multifaceted view of halo science. Experts and novices alike will find this book the definitive resource on the subject. Features include:
The "how to" in halo observation and photographyCarefully analyzed photos of rare halo displays and pyramidal ice crystalsThe early history of halo scienceElegant new explanations of how halos formAuthoritative discussion of odd radius halosWe invite you to gaze up and discover the world of halos.
English
Preface vii
1 Introduction 1
2 Ice Crystal Gallery 9
3 The Beginnings of Halo Science 21
4 How Halos Form 33
5 Halo Simulations 43
6 Halos From Prismatic Crystals 51
7 Odd Radius Halos Are Real 65
8 Odd Radius Circular Halos 71
9 Some Crystallography 91
10 Pyramidal Ice Crystals 101
11 The Search For Angle x 113
12 Refraction Halos and Wedge Angle 129
13 The Spin Vector 133
14 A User's Guide To Halo Poles 137
15 Odd Radius Plate Arcs 145
16 Odd Radius Column Arcs 165
17 Odd Radius Parry Arcs 179
18 Other Wedge Angles? 183
Appendix A: Pattern for Crystal Model 195
Appendix B: Halo Terminology 197
Appendix C: Halo Observation and Photography 199
Appendix D: From Pixels to Degrees 203
Appendix E: More Crystallography 211
ppendix F: Living on the (w)Edge 219
Bibliography 227
Index 233
