Table 2
Quiet Sun historical irradiances and radiances.
| log T[K] | MH73 | H74 | M76 | PEVE | EUNIS07 | |
| F10.7 cm | 177 | 123 | 102 | 69 | 67 | |
|
|
||||||
| He ii 237 | 0.44 | 0.57 | – | 0.46 | – | |
| He ii 243 | 1.1 | 0.95 | – | 0.89 | – | |
| He ii 304 | – | 72(bl, 2348) | – | 63(bl, 2054) | 55 (1784) | |
| He ii (dbl) 256.3 | ?4.1 (?101) | 3.0 (74∗) | – | 2.0 (49) | – | |
| O vi 184.1 | 5.5 | 0.12 (3.0∗) | – | – | – | – |
| Fe viii 185.21 | 5.6 | 0.44 (11) | – | – | 0.35 (9) | 0.32 (8∗) |
| Si vii 275.35 | 5.75 | 0.28 (7) | 0.25 (6∗) | – | 0.35 (9) | – |
| Mg vii (bl) 278.40 | 5.8 | 0.34 (8) | 0.36 (9∗) | – | 0.33 (8) | – |
| Fe ix 171.06 | 5.85 | 4.4 (109) | 4.2 (104∗) | 4.4 (109) | 7.0 (173∗) | – |
| S viii (bl) 198.53 | 5.9 | 0.23 (6∗) | – | – | 0.26 (6.4) | – |
| Fe x 174.53 | 6.0 | 4.6 (114) | 4.1 (101) | 4.2 (104) | 3.7 (91) | 4.3 (107∗) |
| Fe x 177.2 | 6.0 | 2.6 (64) | 2.2 (54) | 2.6 (64) | 2.3 (57) | 2.2 (55∗) |
| Fe x 184.52 | 6.0 | 1.0 (25) | 1.2 (30) | 1.0 (25) | 1.2 (30) | 1.1 (27∗) |
| Fe x (bl) 190.0 | 6.0 | 0.53 (13) | 0.55 (14) | 0.57 (14) | 0.65(16) | 0.51 (12.5∗) |
| Fe xii 193.50 | 6.1 | 3.2 (80) | 3.1 (77) | 2.4 (59) | 1.0 (25) | 0.88 (21.7∗) |
Notes.The columns indicate the main ion and wavelength (Å), the approximate formation temperature (log T[K]), then the MH73, H74, M76, and PEVE irradiances (108 phot cm-2 s-1). The values in brackets indicate the estimated QS radiances (phot cm-2 s-1 arcsec-2). The last column gives the EUNIS07 measured QS radiances (in brackets), and the QS irradiances estimated from them. The 10.7 cm radio flux in 10-22 W m-2 Hz-1 is also shown. The values with an asterisk are those chosen as reference.
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