Why is the spectrum of the Earth’s night sky identical to the spectrum of the auroras? Why is there one difference

Why is the spectrum of the Earth’s night sky identical to the spectrum of the auroras? Why is there one difference in the spectrum of auroras – a strong emission line of Ha, shifted towards the violet side?

The spectrum of the night sky and the spectrum of auroras are determined by the radiation of atoms and molecules of oxygen and nitrogen, which are the main components of the earth’s atmosphere. The Hc line appears in a stream of solar plasma invading the earth’s atmosphere.

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