Dark Marks on the Solar Surface, Strongly Magnetic

This page is the CodyCross answer for the clue below from Past and Present Tech, Group 1446, Puzzle 4 (Pagers and Beepers).

Question is: Dark Marks on the Solar Surface, Strongly Magnetic

and the answer is: SUNSPOTS

Word Meaning:

SUNSPOTS — plural of sunspot

Definitions from Wiktionary.