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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