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Table 1.
Observed line or band characteristics.
| Instrument | Wavelength | Line or band | log T [K] | Atmospheric regime |
|---|---|---|---|---|
| IRIS | 2796 | Mg II k | 3.6–3.9 | Chromosphere |
| 2803 | Mg II h | 3.6–3.9 | Chromosphere | |
| Mg II k peak | 3.9 | Upper chromosphere | ||
| THEMIS | Hα | 3.6–3.9 | Chromosphere | |
| SDO/AIA | 304 | He II | 4.7 | Chromosphere, TR |
| 171 | Fe IX | 5.5 | Upper transition region | |
| 193 | Fe XII, Fe XXIV | 6 | Corona | |
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