Table 1
Parameters of the loss function for the considered fits.
| Fit | Temperature range (K) | χ∗ | α |
|
|
|||
| CHIANTI | T ≤ 1.26 × 104 | 2.02 × 10-15 | 8.06 |
| 1.26 × 104 < T ≤ 1.58 × 104 | 5.60 × 10-2 | 4.78 | |
| 1.58 × 104 < T ≤ 2.51 × 104 | 1.36 × 1024 | −1.26 | |
| 2.51 × 104 < T ≤ 3.16 × 104 | 1.46 × 1017 | 0.32 | |
| 3.16 × 104 < T ≤ 7.9 × 104 | 3.11 × 1011 | 1.58 | |
| 7.9 × 104 < T ≤ 105 | 4.44 × 1016 | 0.53 | |
| 105 < T ≤ 1.25 × 105 | 2.31 × 1020 | −0.22 | |
| 1.25 × 105 < T ≤ 2 × 105 | 1.44 × 1017 | 0.41 | |
| 2 × 105 < T ≤ 2.51 × 105 | 1.20 × 1019 | 0.05 | |
| 2.51 × 105 < T ≤ 3.98 × 105 | 2.02 × 1027 | −1.47 | |
| 3.98 × 105 < T ≤ 7.94 × 105 | 6.38 × 1017 | 0.22 | |
| 7.94 × 105 < T ≤ 106 | 1.40 × 1019 | 0.0 | |
| 106 < T ≤ 2 × 106 | 1.26 × 1024 | −0.82 | |
| 2 × 106 < T ≤ 3.98 × 106 | 4.14 × 1028 | −1.54 | |
| 3.98 × 106 < T ≤ 107 | 7.74 × 1016 | 0.23 | |
| 107 < T ≤ 3.16 × 107 | 2.06 × 1025 | − 0.98 | |
| T > 3.16 × 107 | 3.20 × 1016 | 0.20 | |
|
|
|||
| Hildner | T ≤ 15 × 103 | 1.76 × 10-13 | 7.4 |
| 15 × 103 < T ≤ 8 × 104 | 4.29 × 1010 | 1.8 | |
| 8 × 104 < T ≤ 3 × 105 | 2.86 × 1019 | 0.0 | |
| 3 × 105 < T ≤ 8 × 105 | 1.41 × 1033 | −2.5 | |
| T > 8 × 105 | 1.97 × 1024 | −1.0 | |
|
|
|||
| Klimchuk- | T ≤ 9.33 × 104 | 3.91 × 109 | 2.0 |
| Raymond | 9.33 × 104 < T ≤ 4.68 × 105 | 3.18 × 1024 | −1.0 |
| 4.68 × 105 < T ≤ 1.51 × 106 | 6.81 × 1018 | 0.0 | |
| 1.51 × 106 < T ≤ 3.55 × 106 | 1.27 × 1028 | −1.5 | |
| 3.55 × 106 < T ≤ 7.94 × 106 | 1.24 × 1016 | 0.33 | |
| T > 7.94 × 106 | 1.97 × 1025 | −1.0 | |
Notes. The fit derived from computations based on the CHIANTI atomic database assuming coronal abundances was used in Parenti et al. (2006). Hildner’s and Klimchuk-Raymond’s fits are adapted from Hildner (1974) and Klimchuk & Cargill (2001), respectively. Quantities are expressed in MKS units.
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