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| − | [[File:Goes-stix-scatter.png|400px|thumb|none| Left: Histogram of STIX counts versus GOES flux in log-log scale. | + | [[File:Goes stix flux fit lms.png|800px|thumb|none| Scatter plot of STIX counts (4 - 10 keV) versus GOES and as well as a linear fit and a polynomial fit to the data. ]] |
| − | 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. ]] | + | The GOES flux of a solar flare is estimated using<br> |
| | + | flux=10^(p0+p1*x), <br> |
| | + | with x=log10(stix_peak_counts*r^2)<br> |
| | + | where p0, p1 are the parameters from the 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. <br> |
| | | | |
| − | Table: STIX counts vs GOES flux
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| − | {| class="wikitable"
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| − | |-
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| − | ! scope="col"| log10(stix_counts/R^2)
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| − | ! scope="col"| log10(goes_flux)
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| − | ! scope="col"| std
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| − | |-
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| | | | |
| − | | 1.525 || -6.25125 || na
| + | [[File:Goes_background.png |600px|thumb|none| An example of estimated GOES flux background. ]] |
| − | |-
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| − | | 1.655 || -6.67554 || 0.111809
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| − | |-
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| − | | 1.785 || -6.55375 || 0.184885
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| − | |-
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| − | | 1.915 || -6.54825 || 0.229522
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| − | |-
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| − | | 2.045 || -6.56475 || 0.195695
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| − | |-
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| − | | 2.175 || -6.55637 || 0.198651
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| − | |-
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| − | | 2.305 || -6.57996 || 0.200228
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| − | |-
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| − | | 2.435 || -6.47682 || 0.223041
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| − | |-
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| − | | 2.565 || -6.46797 || 0.216562
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| − | |-
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| − | | 2.695 || -6.41793 || 0.27564
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| − | |-
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| − | | 2.825 || -6.36375 || 0.223797
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| − | |-
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| − | | 2.955 || -6.3481 || 0.268878
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| − | |-
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| − | | 3.085 || -6.24556 || 0.246008
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| − | |-
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| − | | 3.215 || -6.23418 || 0.235726
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| − | |-
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| − | | 3.345 || -6.15042 || 0.320178
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| − | |-
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| − | | 3.475 || -6.1948 || 0.240977
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| − | |-
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| − | | 3.605 || -6.09313 || 0.25082
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| − | |-
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| − | | 3.735 || -5.96493 || 0.265629
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| − | |-
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| − | | 3.865 || -5.93862 || 0.35869
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| − | |-
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| − | | 3.995 || -5.83875 || 0.146257
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| − | |-
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| − | | 4.125 || -5.85643 || 0.179611
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| − | |-
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| − | | 4.255 || -5.83875 || 0.169521
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| − | |-
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| − | | 4.385 || -5.59125 || 0.124728
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| − | |-
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| − | | 4.515 || -5.37125 || 0.0388909
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| − | |-
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| − | | 4.645 || -5.4675 || 0.227187
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| − | |-
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| − | | 4.775 || -5.40563 || 0.187903
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| − | |-
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| − | | 5.165 || -4.76625 || 0.0825
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| − | |-
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| − | | 5.295 || -4.62875 || 0.406033
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| − | |-
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| − | | 5.555 || -4.76625 || 0.33
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| − | |-
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| − | | 5.945 || -4.68375 || na
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| − | |}
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| − | | |
| − | The GOES flux of a flare is estimated using
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| − | flux=10^(p0+p1*x+p2**x^2), | |
| − | with x=log10(stix_peak_counts)/r^2
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| − | where p0, p1, p2 are the parameters from the polynomial curve fit,
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| − | peak_counts is the STIX QL LC peak counts and r is the distance between the Sun and solar orbiter in units of au.
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