About the Author Slides from the Lecture Presidential Lecture 1992 - James A. Van Allen

Figure 16. A log-log plot of magnetic moments M (in gauss cmÜ) of astronomical objects, as labeled, vs. their angular momenta Iw (in g cmÛ sÜ). Definitive values are shown as solid circles for mercury, Earth, Mars, Jupiter, Saturn, Uranus, and Neptune. The straight line is the least squares fit to these seven points. Upper limit values of M are shown for the Moon and Venus. The rectangular box includes the best available values for pulsars and the open circle gives a nominal value of M for the Sun corresponding to an equatorial “surface” field of 1.0 gauss.


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