There is a slight difference between The Sun’s annula and corona.
Both are circular rings of light from the Sun, but the annula is a ring of the Sun’s surface visible during an annular eclipse. The ring-shaped corona, an everpresent bright and flaring indication of the Sun’s tremendous energy, extends around the Sun.
It usually cannot be seen because of the blinding brilliance of the Sun itself, but is visible during an annular eclipse. Its shooting flames of light extend thousands of miles into space.