Contents

18 August 1989
Vol 245, Issue 4919

About The Cover

Polar view of the sun constructed from Kitt Peak magnetograms, showing magnetic flux drifting from the sunspot belt toward the negative-polarity north pole during August 1983. The poleward streams, which form a rigidly rotating spiral pattern, gradually establish a strong “topknot” polar field as the 1986 sunspot minimum approaches. See page 712. [Image created at the Naval Research Laboratory from data provided by J. W. Harvey]