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]