Sunspots are strong magnetic regions that disrupt the outward flow of heat from the sun's interior. (discovermagazine.com)
Hard drives store data on discs coated with a metallic film divided into tiny magnetic regions, each of which stores a single bit — the more regions you can squeeze on to a disc, the bigger the capacity. (newscientist.com)
What they found came as a surprise: As the object rotated, a powerful magnetic region came into view, more powerful than the magnetic fields associated with sunspots that we observe on the sun. (science.howstuffworks.com)