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Sunspots and solar prominences, 1973

Sunspots and solar prominences, 1973


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Sunspots and solar prominences, 1973

Sunspots and solar prominences, 1973. Image from Skylabs solar telescope. Sunspots are relatively cool areas on the Suns surface, the photosphere. Their temperature is about 3800 degrees Kelvin, as opposed to around 5800 degrees on the rest of the photosphere, and they can measure as much as 50, 000 kilometres across. The number of sunspots is greatest at the point in the cycle of solar activity known as the solar maximum, which occurs roughly every 11 years. They form when magnetic field lines below the surface become twisted and protrude through the photosphere. Sunspots are closely associated with the occurrence of solar flares, or prominences, massive eruptions of ionized hydrogen gas, often larger than the Earth, which arch away from the surface of the Sun. Some violent flares called Coronal Mass Ejections interact with the Earths magnetic field and can disrupt radio communications and produce spectacular aurora displays

Media ID 14863824

© Oxford Science Archive / Heritage-Images

1970s Nasa Oxford Science Archive Prominence Radiation Seventies Skylab Solar Astronomy Solar Flare Space Space Station Star Sunspot


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