MikeL, delighted you called out the green you captured. It is pretty unusual on its own, other than auroras, I think. We have discussed green before on this forum (q.v.). And if you look at Jari's 'Recent cloud snaps' thread, mamma mia in olive green.
I searched the CAS Gallery for 'green' and it's mostly place and people names that come up, but this green flash is quite recent and drew forth several comments (there is an older one down Ginni's way):
There are two types apparently:
P.S. Given that one comment was from Ian, it's nice to know he is on the ball, but has he forgotten the forum?