Table 1
Active region abundance measurements relative to iron.
| Photospheric | Coronal | |||||||||||
| Fe/El. | (FIP) | E68 | D75 | E | P77 | W94 | M94 | D13 | Present | A09 | F92 | S12 |
|
|
||||||||||||
| Fe/Ne | (21.6) | 2.5 | 1.7 | – | 1.0 | 1.1 | – | – | 1.2 | 0.37† | 1.05 | 0.88 |
| Fe/Ar | (15.8) | – | – | 13.2 | – | – | 25 | 50 | – | 12.6† | 33 | 31 |
| Fe/O | (13.6) | 0.28 | 0.26 | – | 0.16 | 0.16 | – | – | 0.2 | 0.065 | 0.16 | 0.17 |
| Fe/S | (10.4) | – | – | – | – | – | 4.0 | 6.8 | – | 2.4 | 6.8 | 4.2 |
| Fe/Si | (8.1) | – | – | – | – | – | – | 1.0 | – | 1.0 | 1.0 | 0.98 |
| Fe/Mg | (7.6) | – | – | – | 1.0 | 1.05 | – | 0.8 | – | 0.8 | 0.9 | 0.96 |
| Fe/Ni | (7.6) | 6.0 | – | – | 17.8 | – | 8.3 | 29.5 | – | 19.1 | 18.2 | 19.9 |
| Fe/Ca | (6.1) | – | – | 11.2 | – | – | – | 13.5 | – | 14.5 | 14.8 | 16.2 |
Notes. The abundances are listed with decreasing FIP of the element (eV, the FIP of Fe is 7.9). Previous values from quiescent active region observations: E68: Evans & Pounds (1968); D75: Davis et al. (1975); E: Mason (1975) for Ca and Young et al. (1997) for Ar; P77: Parkinson (1977); W94: Waljeski et al. (1994); M94: Monsignori Fossi et al. (1994); D13: Del Zanna (2013b), obtained from Hinode EIS in the EUV. For reference, we show the Asplund et al. (2009) [A09] photospheric abundances ( the Ne and Ar values are not obtained from photospheric measurements) and the generic coronal abundances of Feldman et al. (1992) [F92] and Schmelz et al. (2012) [S12].
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