Table 1
Fit parameters for centre-to-limb variation for various lines from USUN and (in the case of the O v 630 Å line) SYNOP mosaics.
| Data set | Power law | Quadratic | ||||||||||||
| log Ip(1) | α |
|
log Iq(1) | a | b |
|
||||||||
|
|
||||||||||||||
| He i 584 Å: | ||||||||||||||
| USUN[2007–2009] : | 2.494 (0.0045) | 0.020 (0.014) | 0.9902 (0.0095) | 2.502 (0.0088) | –0.055 (0.048) | 0.04 (0.057) | 0.975 (0.025) | |||||||
| USUN[maximum] : | 2.605 (0.012) | 0.03 (0.035) | 0.987 (0.023) | 2.71 (0.028) | –0.54 (0.13) | 0.54 (0.14) | 0.81 (0.096) | |||||||
| SYNOP[1996–1997]: | 2.590 (0.0067) | 0.379 (0.016) | 0.841 (0.011) | 2.597 (0.012) | –0.13 (0.073) | –0.28 (0.078) | 0.827 (0.066) | |||||||
| SYNOP[2007–2009]: | 2.538 (0.0072) | 0.331 (0.013) | 0.858 (0.025) | 2.546 (0.013) | –0.12 (0.075) | –0.25 (0.076) | 0.840 (0.030) | |||||||
| SYNOP[maximum] : | 2.535 (0.021) | 0.12 (0.046) | 0.943 (0.080) | 2.71 (0.046) | –0.83 (0.20) | 0.67 (0.20) | 0.69 (0.12) | |||||||
| He i 537 Å: | ||||||||||||||
| USUN[2007–2009] : | 1.548 (0.0051) | –0.067 (0.015) | 1.034 (0.0095) | 1.556 (0.0095) | –0.03 (0.051) | 0.10 (0.059) | 1.02 (0.026) | |||||||
| USUN[maximum] : | 1.645 (0.011) | –0.02 (0.028) | 1.01 (0.027) | 1.73 (0.026) | –0.43 (0.12) | 0.46 (0.12) | 0.86 (0.11) | |||||||
| He i 522 Å: | ||||||||||||||
| USUN[2007–2009] : | 0.9754 (0.0053) | –0.141 (0.014) | 1.076 (0.0093) | 0.984 (0.0099) | –0.02 (0.052) | 0.16 (0.057) | 1.05 (0.028) | |||||||
| USUN[maximum] : | 1.04 (0.011) | –0.11 (0.030) | 1.06 (0.022) | 1.13 (0.025) | –0.43 (0.12) | 0.55 (0.12) | 0.89 (0.11) | |||||||
| He i 516 Å: | ||||||||||||||
| USUN[2007–2009] : | 0.745 (0.0086) | –0.10 (0.022) | 1.055 (0.010) | 0.752 (0.017) | –0.02 (0.086) | 0.12 (0.094) | 1.04 (0.028) | |||||||
| USUN[maximum] : | 0.863 (0.011) | –0.11 (0.028) | 1.06 (0.031) | 0.974 (0.025) | –0.53 (0.12) | 0.64 (0.12) | 0.86 (0.11) | |||||||
| He ii 304 Å: | ||||||||||||||
| USUN[2007–2009] : | 3.228 (0.0048) | –0.11 (0.015) | 1.06 (0.014) | 3.227 (0.0087) | 0.04 (0.049) | 0.070 (0.057) | 1.06 (0.030) | |||||||
| USUN[maximum] : | 3.300 (0.011) | –0.050 (0.032) | 1.03 (0.034) | 3.357 (0.023) | –0.29 (0.11) | 0.37 (0.12) | 0.921 (0.084) | |||||||
| O iii 600 Å: | ||||||||||||||
| USUN[2007–2009] : | 1.404 (0.0039) | –0.603 (0.012) | 1.431 (0.013) | 1.391 (0.0065) | 0.26 (0.037) | 0.32 (0.044) | 1.45 (0.018) | |||||||
| USUN[maximum] : | 1.444 (0.0077) | –0.553 (0.023) | 1.38 (0.023) | 1.44 (0.016) | 0.15 (0.080) | 0.41 (0.088) | 1.37 (0.038) | |||||||
| O iv 554 Å: | ||||||||||||||
| USUN[2007–2009] : | 2.081 (0.0059) | –0.675 (0.020) | 1.51 (0.023) | 2.072 (0.0097) | 0.26 (0.057) | 0.39 (0.070) | 1.50 (0.038) | |||||||
| USUN[maximum] : | 2.080 (0.0084) | –0.597 (0.026) | 1.43 (0.040) | 2.087 (0.017) | 0.13 (0.089) | 0.46 (0.10) | 1.38 (0.046) | |||||||
| O v 630 Å: | ||||||||||||||
| USUN[2007–2009] : | 2.291 (0.0047) | –0.610 (0.015) | 1.439 (0.013) | 2.283 (0.0079) | 0.22 (0.044) | 0.39 (0.052) | 1.44 (0.023) | |||||||
| USUN[maximum] : | 2.342 (0.0088) | –0.513 (0.023) | 1.34 (0.020) | 2.346 (0.019) | 0.088 (0.088) | 0.45 (0.093) | 1.32 (0.047) | |||||||
| SYNOP[1996–1997]: | 2.327 (0.0063) | –0.480 (0.014) | 1.32 (0.018) | 2.336 (0.010) | 0.05 (0.062) | 0.46 (0.067) | 1.28 (0.074) | |||||||
| SYNOP[2007–2009]: | 2.321 (0.0071) | –0.465 (0.015) | 1.30 (0.022) | 2.316 (0.013) | 0.12 (0.064) | 0.39 (0.066) | 1.31 (0.049) | |||||||
| SYNOP[maximum] : | 2.312 (0.012) | –0.541 (0.025) | 1.37 (0.055) | 2.36 (0.024) | –0.20 (0.12) | 0.77 (0.13) | 1.20 (0.11) | |||||||
| Mg x 625 Å: | ||||||||||||||
| USUN[2007–2009] : | 1.380 (0.0083) | –0.644 (0.021) | 1.48 (0.032) | 1.36 (0.016) | 0.23 (0.075) | 0.44 (0.081) | 1.50 (0.089) | |||||||
| USUN[maximum] : | 1.59 (0.026) | –0.61 (0.067) | 1.4 (0.23) | 1.67 (0.055) | –0.29 (0.26) | 0.93 (0.28) | 1.2 (0.41) | |||||||
| Si xi 303 Å: | ||||||||||||||
| USUN[2007–2009] : | 1.619 (0.013) | –0.32 (0.046) | 1.19 (0.065) | 1.59 (0.022) | 0.32 (0.14) | –0.07 (0.18) | 1.3 (0.13) | |||||||
| USUN[maximum] : | 2.21 (0.026) | –0.44 (0.094) | 1.3 (0.26) | 2.35 (0.058) | –0.59 (0.28) | 1.1 (0.32) | 1.0 (0.43) | |||||||
| Si xii 521 Å: | ||||||||||||||
| USUN[2007–2009] : | 0.383 (0.013) | –0.32 (0.045) | 1.2 (0.12) | 0.354 (0.024) | 0.30 (0.14) | –0.03 (0.17) | 1.3 (0.17) | |||||||
| USUN[maximum] : | 1.41 (0.040) | –0.44 (0.13) | 1.3 (0.44) | 1.59 (0.089) | –0.81 (0.43) | 1.3 (0.48) | 0.91 (0.58) | |||||||
Notes. Standard deviations are in parentheses. The O iv 554
Å radiances refers to the sum of all the fine structure components. The quantities
Ip(1) and Iq(1)
are centre-disk radiances estimated from power-law and quadratic fits respectively
(photons s-1 cm-2 arcsec-2). The
and
are the correction factors to
obtain the mean disk radiance from the centre-disk radiances (Eq. (4)), for the quadratic (Eq. (2)) and power-law (Eq. (3)) fits, respectively.
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.