NASA's Solar Dynamics Observatory studies our Sun in 10 different waves, as each of them demonstrates different stellar features. This view of the Sun of September 21, 2018 uses two selected images taken at almost the same time, but with different wavelengths of ultraviolet light.
The red tinted frame, a spectacular material high above the solar surface, is particularly well suited for displaying details at the edge of the Sun, such as a small prominence. The brown image clearly reflects two large coronal holes (darker areas), as well as some weak magnetic field lines and hints of solar activity (lighter areas). This activity takes place in the star's crown.