Not-as-hot spots on the Sun
"On February 15, 1564, Galileo Galilei was born in Pisa, Italy. Galileo was an important person in the history of space weather. Contrary to popular belief, he didn't discover sunspots. He was one of the first to observe them using a telescope.
"In Galileo's day, many people believed sunspots were satellites of the sun. Galileo proved otherwise. By drawing sunspots every day, he discovered that the sun spins and that sunspots are located on (or very near) the sun's surface. Galileo thought sunspots might be clouds.
"Now we know what sunspots really are: magnetic islands. Sunspots consist of magnetic force-fields poking through the sun's surface from below. Sometimes these magnetic fields erupt, producing a solar flare. With a temperature of 'only' a few thousand degrees Celsius, sunspots are cooler than their surroundings and, thus, they appear dark. Sunspots are as big as planets."
"In Galileo's day, many people believed sunspots were satellites of the sun. Galileo proved otherwise. By drawing sunspots every day, he discovered that the sun spins and that sunspots are located on (or very near) the sun's surface. Galileo thought sunspots might be clouds.
"Now we know what sunspots really are: magnetic islands. Sunspots consist of magnetic force-fields poking through the sun's surface from below. Sometimes these magnetic fields erupt, producing a solar flare. With a temperature of 'only' a few thousand degrees Celsius, sunspots are cooler than their surroundings and, thus, they appear dark. Sunspots are as big as planets."
Not-as-hot spots on the Sun
mr damon, 07:38
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