Table 1.
Comparison of predicted and observed quiet-Sun UV and EUV radiances.
| Ion | λobs | Iobs | Tmax | Teff | R1 | R2 |
|---|---|---|---|---|---|---|
| S II | 1253.80 | 15.9 | 4.50 | 4.41 | 1.05 | |
| S II | 1102.30 | 4.4 | 4.55 | 4.44 | 1.08 | |
| N II | 1085.70 | 36.7a | 4.65 | 4.49 | 1.34 | |
| N II | 915.60 | 5.0 | 4.70 | 4.53 | 0.77 | |
| Si III | 1206.50 | 694.6 | 4.80 | 4.57 | 0.82 | |
| S III | 1200.96 | 8.0b | 4.80 | 4.64 | 1.09 | |
| N III | 991.60 | 47.2 | 4.95 | 4.88 | 0.73 | |
| N III | 685.70 | 23.7 | 4.95 | 4.95 | 1.13 | |
| O III | 702.70 | 56.6 | 5.00 | 4.98 | 0.76 | |
| O III | 525.90 | 23.2 | 5.05 | 5.03 | 0.78 | |
| S IV | 753.70 | 1.4 | 5.05 | 5.05 | 0.99 | |
| S IV | 661.40 | 6.9 | 5.05 | 5.06 | 1.10 | |
| O IV | 554.00 | 159.5 | 5.20 | 5.20 | 1.10 | |
| Ne IV | 544.00 | 9.1 | 5.25 | 5.25 | 0.72 | |
| O V | 630.00 | 335.0 | 5.40 | 5.38 | 1.00 | |
| Ne V | 572.10 | 8.8 | 5.45 | 5.48 | 1.01 | |
| C II | 1335.70 | 1205.0 | 4.60 | 4.45 | 0.92 | 0.71 |
| C II | 1036.30 | 35.9a | 4.65 | 4.49 | 1.92 | 1.29 |
| C III | 977.00 | 702.0a | 4.95 | 4.82 | 0.67 | 1.07 |
| C III | 1176.37 | 36.2a | 4.95 | 4.82 | 0.67 | 1.01 |
| C III | 1175.74 | 104.0a | 4.95 | 4.82 | 0.70 | 1.06 |
| C III | 1174.88 | 37.4a | 4.95 | 4.82 | 0.65 | 0.98 |
| C IV | 1548.20 | 361.0a | 5.05 | 5.07 | 0.30 | 0.68 |
Notes. Ion – principal ion emitting at observed wavelength; λobs (Å) – the observed wavelength; Iobs – the measured radiance (ergs cm−2 s−1 sr−1) using Vernazza & Reeves (1978), except those marked by superscript: (a) using Wilhelm et al. (1998), (b) using Parenti et al. (2005); Tmax and Teff – the maximum and effective temperature using Chianti ionisation equilibria (log values, in K – see text); R1 – the ratio between the predicted and observed intensities using populations from Chianti for all elements; R2 – the same ratio using carbon populations from this work.
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