Open Access

Table 1

The four main auroral lines studied in this paper and their properties. The width in column 5 corresponds to the spectral size of the instrument interference filters and not to the upper atmospheric emission.

Altitude (km) Colour Element Transition Wavelength (nm) Energy threshold (eV)
220 Red O 1D → 3P 630 ± 1 1.96
110 Green O 1S → 1D 557.7 ± 5 4.00
80 Blue 1st negative band 427.8 ± 5 18.75
80 Purple 1st negative band 391.4 ± 5 18.75

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