When Winter Leader, Becky Goodsell, sent these photos, she added the following explanation:
Most auroras are green, with a bit of red, but this one has more colour. Not exactly sure why, but it's to do with what gas is being affected by the particles.
"The color of the aurora depends on the wavelength of the light emitted. This is determined by the specific atmospheric gas and its electrical state, and the energy of the particle that hits the atmospheric gas. The atmosphere consists mainly of nitrogen and oxygen, which emit the characteristic colors of their respective line spectra. Atomic oxygen is responsible for the two main colors of green (wavelength of 557.7 nm) and red (630.0 nm). Nitrogen causes blue and deep red hues."
This is the spectrum of colors emitted by the various atoms in earth’s outer atmosphere, so I guess this one is passing through nitrogen, as well as excited oxygen.
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