Akira - yes, I try to be patient but I'm not, by nature, a very patient person.
The second image is a little too dark and there is a lot of noise in the area where the colour transitions from green to purple, but if you look closely at that area I think you will see there is a narrow band of red between green and purple.
I don't know which colours are rarer - I think it has a lot to do with the latitude from which the aurora is observed. So, north of the Arctic Circle, green predominates, but as you move southwards, the other colour - mainly red and blue - become more important. By the time you are down in Scotland, the green colour is just a narrow band along the horizon, as in my examples. In fact, as I watched the beautifully clear sky darken between about 9.30 and 10.30pm I realised I was beginning to see a band of pale green appearing, just above the line of hills. It's just visible, I think, on the right of this image -