P spot

P spot

[′pē ‚spät]
(astronomy)
One of a pair of sunspots that appears to precede or lead the other across the face of the sun, or whose magnetic polarity is that which is normally found in such a sunspot during that sunspot cycle and in the hemisphere of the sun.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.