19 December 2014 - Mission Day: 6958 - DOY: 353
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SOURCES OF THE SOLAR WIND? --- "Plumes" of outward flowing, hot gas in the Sun's atmosphere may be one source of the solar "wind" of charged particles. These images, taken May 8, 1996, by the Extreme-ultraviolet Imaging Telescope (EIT) on board SOHO show ultraviolet images of polar plumes near the sout solar pole at about 1.5 million degrees Celsius in the Fe XII emission line at 195 A (top) and at somewhat cooler temperature at about 1 million degrees in the Fe IX/X emission lines at 171 A (bottom). These images represent the first opportunity scientists have had to see the detailed development over time of the plume structures in which the solar wind is accelerated, at least at the solar poles. Because of SOHO's continuous view of the Sun, scientists have been able to make movies that allow us to understand the relationship between the magnetic field and the polar plumes.

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