Table 1.
Lines and EUV bands.
| Line (a)/band (b) | log T [K] (d) | T [MK] (d) | |
|---|---|---|---|
| Si I continuum | (Low chromosphere) | ||
| IRIS | Si IV 1393.76 Å | 4.90 | 0.08 |
| O IV 1401.163 Å | 5.18 | 0.15 | |
| 304 Å (He II) | 4.92 | 0.08 | |
| 131 Å (Fe VIII) (c) | 5.76 | 0.58 | |
| AIA | 171 Å (Fe IX) | 5.93 | 0.85 |
| 193 Å (Fe XII) | 6.18 | 1.5 | |
| 211 Å (Fe XV) | 6.27 | 1.9 | |
Notes.
Rest wavelengths for Si IV and O IV taken from Sandlin et al. (1986).
The 131 Å band has a significant contribution also from Fe XXI around 10 MK (Lemen et al. 2012), but this is not relevant for our quiet-Sun observations.
For Si IV and O IV, T is the line formation temperature in the MHD model as given by Peter et al. (2006), their Table 1. For the AIA channels, the peak temperature T of the contribution function is listed based on Peter et al. (2022), their Fig. 9.
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