Table B.1.
Coefficients describing the variation of the solar radiation in the Lyman-α and higher Lyman lines.
| Date | Value of 400-days averaged | Coefficient for | Coefficient for |
|---|---|---|---|
| LISIRD index [10−2 W m−2] | Lyman-α line | higher Lyman lines | |
| 1995/01/01 | 0.644 | 1.065 | 1.037 |
| 1995/05/01 | 0.642 | 1.062 | 1.033 |
| 1995/09/01 | 0.635 | 1.050 | 1.022 |
| 1996/01/01 | 0.627 | 1.038 | 1.010 |
| 1996/05/01 | 0.622 | 1.028 | 1.001 |
| 1996/05/15 | 0.621 | 1.027 | 1.000 |
| 1996/09/01 | 0.620 | 1.026 | 0.998 |
| 1997/01/01 | 0.622 | 1.029 | 1.001 |
| 1997/05/01 | 0.634 | 1.048 | 1.020 |
| 1997/09/01 | 0.654 | 1.081 | 1.052 |
| 1998/01/01 | 0.684 | 1.131 | 1.101 |
| 1998/05/01 | 0.725 | 1.199 | 1.168 |
| 1998/09/01 | 0.765 | 1.266 | 1.232 |
| 1999/01/01 | 0.798 | 1.321 | 1.286 |
| 1999/05/01 | 0.822 | 1.360 | 1.324 |
| 1999/09/01 | 0.847 | 1.400 | 1.363 |
| 2000/01/01 | 0.876 | 1.449 | 1.410 |
| 2000/05/01 | 0.895 | 1.479 | 1.440 |
| 2000/09/01 | 0.894 | 1.478 | 1.439 |
| 2001/01/01 | 0.879 | 1.455 | 1.416 |
| 2001/05/01 | 0.874 | 1.445 | 1.407 |
| 2001/09/01 | 0.894 | 1.478 | 1.439 |
| 2002/01/01 | 0.905 | 1.498 | 1.458 |
| 2002/05/01 | 0.908 | 1.502 | 1.463 |
| 2002/09/01 | 0.864 | 1.429 | 1.392 |
| 2003/01/01 | 0.823 | 1.361 | 1.325 |
| 2003/05/01 | 0.797 | 1.318 | 1.283 |
| 2003/09/01 | 0.768 | 1.271 | 1.237 |
| 2004/01/01 | 0.755 | 1.248 | 1.215 |
| 2004/05/01 | 0.734 | 1.214 | 1.182 |
| 2004/09/01 | 0.715 | 1.183 | 1.151 |
| 2005/01/01 | 0.702 | 1.161 | 1.130 |
| 2005/05/01 | 0.687 | 1.137 | 1.107 |
| 2005/09/01 | 0.668 | 1.105 | 1.076 |
| 2006/01/01 | 0.657 | 1.087 | 1.058 |
| 2006/05/01 | 0.648 | 1.072 | 1.043 |
| 2006/09/01 | 0.643 | 1.063 | 1.035 |
| 2007/01/01 | 0.636 | 1.052 | 1.024 |
| 2007/05/01 | 0.626 | 1.034 | 1.007 |
| 2007/09/01 | 0.615 | 1.018 | 0.991 |
| 2008/01/01 | 0.609 | 1.008 | 0.981 |
| 2008/05/01 | 0.605 | 1.001 | 0.974 |
| 2008/06/25 | 0.605 | 1.000 | 0.973 |
| 2008/09/01 | 0.603 | 0.997 | 0.970 |
| 2009/01/01 | 0.602 | 0.996 | 0.970 |
| 2009/05/01 | 0.604 | 0.999 | 0.973 |
| 2009/09/01 | 0.613 | 1.014 | 0.987 |
| 2010/01/01 | 0.625 | 1.033 | 1.006 |
| 2010/05/01 | 0.640 | 1.059 | 1.031 |
| 2010/09/01 | 0.653 | 1.080 | 1.051 |
| 2011/01/01 | 0.674 | 1.115 | 1.086 |
| 2011/05/01 | 0.704 | 1.164 | 1.133 |
| 2011/09/01 | 0.738 | 1.221 | 1.189 |
| 2012/01/01 | 0.752 | 1.243 | 1.210 |
| 2012/05/01 | 0.761 | 1.258 | 1.225 |
| 2012/09/01 | 0.749 | 1.238 | 1.205 |
| 2013/01/01 | 0.753 | 1.245 | 1.212 |
| 2013/05/01 | 0.757 | 1.253 | 1.220 |
| 2013/09/01 | 0.777 | 1.285 | 1.251 |
| 2014/01/01 | 0.793 | 1.311 | 1.276 |
| 2014/05/01 | 0.806 | 1.333 | 1.298 |
| 2014/09/01 | 0.813 | 1.344 | 1.308 |
| 2015/01/01 | 0.808 | 1.337 | 1.301 |
| 2015/05/01 | 0.791 | 1.308 | 1.274 |
| 2015/09/01 | 0.762 | 1.261 | 1.227 |
| 2016/01/01 | 0.727 | 1.202 | 1.170 |
| 2016/05/01 | 0.703 | 1.162 | 1.131 |
| 2016/09/01 | 0.671 | 1.109 | 1.080 |
| 2017/01/01 | 0.651 | 1.076 | 1.047 |
| 2017/05/01 | 0.637 | 1.054 | 1.026 |
| 2017/09/01 | 0.629 | 1.040 | 1.012 |
| 2018/01/01 | 0.621 | 1.028 | 1.001 |
| 2018/05/01 | 0.612 | 1.013 | 0.986 |
| 2018/09/01 | 0.606 | 1.002 | 0.975 |
| 2019/01/01 | 0.604 | 0.999 | 0.972 |
| 2019/05/01 | 0.599 | 0.991 | 0.965 |
| 2019/09/01 | 0.599 | 0.991 | 0.965 |
| 2020/01/01 | 0.599 | 0.990 | 0.964 |
| 2020/05/01 | 0.601 | 0.993 | 0.967 |
Notes. The coefficients were derived from a 400-days averaged LISIRD Lyman-α composite index (see Sect. 3.1) for selected dates throughout the lifetime of SOHO. Coefficients for the Lyman-α line are computed with respect to the date of observations used in the present work (June 25, 2008). Coefficients for the higher Lyman lines are computed with respect to the date of observations used in Warren et al. (1998), i.e. May 15, 1996.
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