SOHO observations of the Sun's outer atmosphere (FeXII at 19.5nm)
The level of solar activity goes through a cycle of maxima and minima with one cycle...
For education purposes: A video of the Sun in extreme ultraviolet wavelengths (19.5 nm) taken by SOHO from 2000 until 2008.
Courtesy of SOHO/EIT consortium. SOHO...
