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Table 1.
Basic information on spectral lines observed by SoHO/SUMER and IRIS spectrographs.
| Line | Ion | λ0 [Å] | Transition | Instr. |
|---|---|---|---|---|
| Lyα | H I | 1215.67 | 2p 2P3/2, 1/2 – 1s 2S1/2 | 𝒮 |
| Lyβ | H I | 1025.72 | 3p 2P3/2 – 1s 2S1/2 | 𝒮 |
| Lyγ | H I | 972.54 | 4p 2S1/2 – 1s 2S1/2 | 𝒮 |
| Lyδ | H I | 949.74 | 5p 2P3/2 – 1s 2S1/2 | 𝒮 |
| Mg II k | Mg II | 2796.35 | 3p 2P3/2 – 3s 2S1/2 | ℐ |
| Mg II h | Mg II | 2803.53 | 3p 2P1/2 – 3s 2S1/2 | ℐ |
Notes. λ0 – laboratory central wavelengths for vacuum. Instr. – instrument; 𝒮 for SoHO/SUMER, ℐ for IRIS.
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