This was the second time in my life I saw a corona.
The corona is seen when the Aurora is directly above you and rays seem to fall around you from the zenith of the sky.
NASA says that the corona is considered the most spectacular form of a rayed aurora, appearing overhead with all shafts converging to a center point.

I was using my 14mm f/2.8 wide-angle lens, but yet was able to capture only a part of the huge corona filling the sky.
It was absolutely amazing!