Thanks Paul for posting!
Got me googling: how come the naked eye sees an aurora but without color?
http://odin.gi.alaska.edu/FAQ/#color
From what I understand in the last paragraph, this is due to no photon emission from the excited atoms because, in lower altitudes, they hand over their excitement to their neighboring (e.g. smog-?)atoms, instead.
The reddish glow in your picture is the aurora from lonely oxygen in very
high altitudes which can properly emit their excitement through photons. But do so in wavelengths that our visual organs can hardly perceive.
It is also proof that the ozone
hole is not above your location.
