Table 1.
Parameters of coronal lines measured using summed spectrum taken in near equatorial region of east limb, at radial distance of 3′.
| Wavelength | Ion | FWHM | Ionization | FIP | μ | log(A) | ⟨Ti⟩ | I0/(K+F) | Teff | Vnth |
|---|---|---|---|---|---|---|---|---|---|---|
| (Å) | (Å) | potential (eV) | (eV) | (MK) | (MK) | (km s−1) | ||||
| 5302.86 | Fe XIV | 0.82 ± 0.02 | 361 | 7.9 | 55.85 | 7.6 | 1.8 | 4.3 | 2.6 ± 0.1 | 15.6 ± 1.2 |
| 5116.16 | Ni XIII | 0.85 ± 0.06 | 352 | 7.6 | 58.69 | 6.3 | 1.8 | 0.2 | 3.2 ± 0.4 | 19.7 ± 3.1 |
| 5533.50 ±0.10 | Ar X | 1.03 ± 0.12 | 422 | 15.7 | 39.9 | 6.8 | 2.0 | 0.08 | 2.9 ± 0.7 | 17.2 ± 6.7 |
| 5538.30 ±0.10 | Fe X | 1.03 ± 0.18 | 233 | 7.9 | 55.85 | 7.6 | 1.1 | 0.04 | 3.8 ± 1.5 | ? |
| 5164 | Co XI | ? | 275 | 7.8 | 58.94 | 5.1 | ? | 0.01 | ? | ? |
Notes. Wavelengths are given in air; the FWHM are corrected for the instrumental smearing; μ is the mass of the ion; A is the relative abundance of the ion; ⟨Ti⟩ is the temperature deduced from the ionization equilibrium; I0 is the central intensity of the Gaussian profile of the line measured above the pseudo-continuum background of the K and F corona in units of the intensity of this background; Teff is the temperature deduced from the FWHM without assuming any turbulent broadening; Vnth is the non-thermal velocity (see Eq. (1)). The last row gives tentative values for the expected Co XI line recorded with an extremely low amplitude above the background level. The 5538.3 Å line is attributed to the ion Fe X, following a suggestion given in Del Zanna & DeLuca (2018).
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