This image shows the solar disc as observed by SOHO's Extreme Ultraviolet Imaging Telescope (EIT) at a wavelength of 171 Å, corresponding to emission lines by highly ionized iron atoms (Fe IX/X). This filter probes material in the lower corona, at a temperature of about 1 million Kelvin.
Spots and loops are clearly visible throughout the solar disc, yielding a lot of information about the Sun's magnetic field: loops correspond to closed magnetic field lines, whereas dark spots correspond to open magnetic field lines, extending into outer space.
Photo credit: ESA/NASA - SOHO/EIT
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