Table 3.
Comparison of radiance values (see Fig. 3 for the regions selected, SPICE QS including both S2 and S3).
| Line | SUMER 1997 QS | SPICE 2022 QS | SPICE 2020 AR | SPICE 2022 AR S1 | SPICE 2022 AR S4 |
|---|---|---|---|---|---|
| O III 702.8 | 27.5 | 13.5 ± 5.3 | 22.3 ± 6.6 | 31.0 ± 7.7 | 139.7 ± 17.1 |
| O III 703.8 | 43.5 | 16.4 ± 5.2 | 22.7 ± 6.5 | 38.5 ± 7.6 | 132.6 ± 12.9 |
| Mg IX 706 | – | 3.6 ± 5.3 | 19.1 ± 5.1 | 30.2 ± 7.7 | 33.9 ± 14.4 |
| S IV 748 | 2.9 | 3.8 ± 1.4 | – | 13.3 ± 7.3 | 10.9 ± 14.8 |
| S IV 750 | 6.9 | 5.2 ± 1.9 | – | 17.7 ± 7.4 | 46.1 ± 14.2 |
| N IV 765 | 80.7 | 29.6 ± 4.3 | 32.8 ± 8.6 | 123.7 ± 9.7 | 394.9 ± 16.1 |
| Ne VIII 770 | 73.1 | 30.3 ± 7.3 | 67.2 ± 17.2 | 361.7 ± 11.5 | 1087.4 ± 31.1 |
| Mg VIII 772 | – | 9.3 ± 1.7 | 10.4 ± 3.3 | 57.2 ± 12.0 | 110.0 ± 29.0 |
| S V 786 | 32.1 | 14.3 ± 9.9 | 21.7 ± 6.2 | 77.5 ± 16.4 | 81.4 ± 87.5 |
| O IV 787 | 58.5 | 26.1 ± 9.9 | 38.6 ± 10.3 | 121.1 ± 16.4 | 187.6 ± 86.9 |
| O I/Na VI 988.6 | – | 6.3 ± 14.8 | – | 35.3 ± 22.9 | 45.4 ± 43.3 |
| N III 989.8 | 23.0 | 10.4 ± 14.5 | – | 40.4 ± 22.2 | 175.5 ± 40.2 |
| N III 991.5 | 44.2 | 23.0 ± 14.6 | 12.3 ± 4.8 | 120.5 ± 22.4 | 472.3 ± 77.4 |
| O VI 1032 | 354.0 | 73.3 ± 11.2 | 273.7 ± 69.0 | 1562.0 ± 33.1 | 3046.5 ± 61.3 |
Notes. The radiances are compared with the SUMER instrument ones (QS), taken from Dufresne et al. (2023) and SPICE 2020 (AR) from the region S2 of Brooks et al. (2022). Units of radiances for SUMER are in erg sr−1 cm−2 s−1 and SPICE ones have been converted to mW sr−1 m−2, which are equivalent. Our values are corrected by a degradation factor of 2.5 and the spectral binning of the lines N IV, Ne VIII/Mg VIII and O VI has been accounted for by multiplying the radiances by the binning factor.
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