>>16736777
>>16736603
>>16736742
This is literally the most attenuated wavelength in air. The mean free path for absorption is only 100 um.
>>16736800
All of the lines for nitrogen are in the VUV and wouldn't propogate to ground level https://physics.nist.gov/cgi-bin/ASD/lines1.pl?composition=N%3A100&mytext%5B%5D=N&myperc%5B%5D=100&spectra=N0-2&low_w=100&limits_type=0&upp_w=1000&show_av=2&unit=1&resolution=1000&temp=1&eden=1e17&maxcharge=2&min_rel_int=0&int_scale=2&libs=1
Either way there are tons of things that cause this emission, like ionization from all of the high energy particles precipitating along open field lines at the polar caps