X5.1 solar flare, G4 geomagnetic storm watch

This aurora looks predominantly red. The last big one had pinks and greens easily visible to the naked eye. I wonder what causes the difference.

Has all to do with solar flare energy levels and how/where it interacts in the atmosphere. [1][2]

[1]: https://www.space.com/aurora-colors-explained

[2]: https://www.nps.gov/articles/-articles-aps-v8-i1-c9.htm