GOES Flux vs STIX counts
Left: Histogram of STIX counts versus GOES flux in log-log scale. STIX counts are divided by the squared distances between Solar Orbiter and the Sun. 1045 flares with look-angles from the Earth smaller than 90 degrees are selected. Right: a profile of the histogram and its fit of the quadratic function.
Table: STIX counts vs GOES flux
| log10(stix_counts/R^2) | log10(goes_flux) | std |
|---|---|---|
| 1.525 | -6.25125 | na |
| 1.655 | -6.67554 | 0.111809 |
| 1.785 | -6.55375 | 0.184885 |
| 1.915 | -6.54825 | 0.229522 |
| 2.045 | -6.56475 | 0.195695 |
| 2.175 | -6.55637 | 0.198651 |
| 2.305 | -6.57996 | 0.200228 |
| 2.435 | -6.47682 | 0.223041 |
| 2.565 | -6.46797 | 0.216562 |
| 2.695 | -6.41793 | 0.27564 |
| 2.825 | -6.36375 | 0.223797 |
| 2.955 | -6.3481 | 0.268878 |
| 3.085 | -6.24556 | 0.246008 |
| 3.215 | -6.23418 | 0.235726 |
| 3.345 | -6.15042 | 0.320178 |
| 3.475 | -6.1948 | 0.240977 |
| 3.605 | -6.09313 | 0.25082 |
| 3.735 | -5.96493 | 0.265629 |
| 3.865 | -5.93862 | 0.35869 |
| 3.995 | -5.83875 | 0.146257 |
| 4.125 | -5.85643 | 0.179611 |
| 4.255 | -5.83875 | 0.169521 |
| 4.385 | -5.59125 | 0.124728 |
| 4.515 | -5.37125 | 0.0388909 |
| 4.645 | -5.4675 | 0.227187 |
| 4.775 | -5.40563 | 0.187903 |
| 5.165 | -4.76625 | 0.0825 |
| 5.295 | -4.62875 | 0.406033 |
| 5.555 | -4.76625 | 0.33 |
| 5.945 | -4.68375 | na |
The GOES flux of a flare is estimated using flux=10^(p0+p1*x+p2**x^2), with x=log10(stix_peak_counts)/r^2 where p0, p1, p2 are the parameters from the polynomial curve fit, peak_counts is the STIX QL LC peak counts and r is the distance between the Sun and solar orbiter in units of au.
