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Acknowledgments This small book began during a Wednesday hiking group. Walter Page and my other nontechnical friends often asked questions about my lifelong specialty, the natural magnetic fields of the Earth. I had to find ways to explain these phenomena without equations and to answer types of questions that rarely arise from my more scientific colleagues. I so enjoyed this regular Wednesday challenge that this book developed quite easily. Although most illustrations are of my own creation, I thank the many orga- nizations that provided special figures for this book, in particular the National Geophysical Data Center of NOAA, the Space Environment Center of NOAA, the Geomagnetism Section of USGS, and the Goddard Space Flight Center of NASA. Finally, I thank my wife, Beth, for proofreading the manuscript and toler- ating my time at the computer, away from household duties. W.H.C. xxi
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