Book Reveiw: Introduction to Geomagnetic Fields, Second Edition Wallace H. Campbell, Cambridge University Press, 2003. 337 pp. Hardcover: ISBN 0521822068, $100. Softcover: ISBN 0521529530, $50

Abstract

Any of us who have ever taught magnetics in an undergraduate geophysical exploration course are familiar with the common curly questions regularly asked by students about the Earth's magnetic field. What is the source of the Earth's magnetic field? Why do the magnetic poles not align with the rotational poles? How does an optically pumped magnetometer work? Why does the magnetic field reverse polarity at irregular intervals? How long does a field reversal take? Will we all die if a reversal happens tomorrow? The answers to these and myriad similar questions lie outside the normal range of experience for a large majority of geophysicists, who generally concentrate on measuring the field and interpreting the geological implications of the measurements. It is, therefore, a great relief to be able to refer students to a book such as Campbell's. In five easy-to-read, logically organized chapters, Campbell fills us in on the current theories and beliefs regarding the Earth's magnetic field: the origins of the major component, the causes of periodic fluctuations, the effect the sun has on the Earth's field, measuring methods, and the practical applications of those measurements. Chapter 1 is a necessary evil. It describes the current thoughts on the outer core origin of the major …