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

Figure 8. A graphical assemblage of data observed by the University of Iowa instrument during Pioneer 11's 1 September 1979 passage through the just discovered radiation belts of Saturn. The enlarged panel in the lower part of the figure plots the data that revealed the discovery of a small inner satellite, later thought to be one of those reported in a previous Earth-based observation.

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