![]() ![]() Apparently, the sunspot pairs represent points where the internal magnetic field penetrates the surface at one spot and re-enters at the other. The magnetic fields in the sunspot areas are about 1000 times stronger than the magnetic fields of surrounding, undisturbed areas of the photosphere. If you examine the nature of the magnetic field of a bar magnet, you see that this implies that they are like opposite poles of a magnet. One observation that is part of the answer is that intense magnetic fields are associated with the sunspots, and that sunspots generally occur in pairs with the magnetic field coming out of one and into the other. The obvious question is "What causes the sunspots?". A large group of spots typically lasts 50 days. Individual spots may last from 1 to 100 days. ![]() At some times the Sun has hundreds of sunspots, while at other times it may have almost none. They often occur in groups, and come and go. They typically measure about 10,000 kilometers across, which makes them on the order of the size of the Earth. Galileo was the first to study dark spots on the Sun which we call "sunspots". Sunspots and Solar Storms Sunspots and Solar Storms NASA image.
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