The Sun with handle-shaped prominence, 14 September 1999.
© National Aeronautics & Space Administration / Science & Society
Extreme Ultraviolet Imaging Telescope (EIT) image of a huge, handle-shaped prominence taken in the 304 angstrom wavelength. Prominences are huge clouds of relatively cool dense plasma suspended in the Sun's hot, thin corona. At times they can erupt, escaping the Sun's atmosphere. Emission in this spectral line shows the upper chromosphere at a temperature of about 60,000 degrees K. Every feature in the image traces magnetic field structure. The hottest areas appear almost white, while the darker red areas indicate cooler temperatures.