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− | [[File:Goes stix.png|800px|thumb|none| Fig. 1: Scatter plot of STIX counts (4 - 10 keV) versus GOES flux and histogram of STIX counts versus GOES flux. | + | [[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 background subtracted and divided by the squared distances between Solar Orbiter and the Sun.
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− | 1045 flares with Earth look-angles smaller than 90 degrees were selected. ]]
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− | [[File:Goes stix flux fit.png|600px|thumb|none| Fig. 2 A profile of the histogram shown in Fig. 1. The errors are root mean squares. A cubic function fitted to the profile is also shown. ]]
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| The GOES flux of a solar flare is estimated using<br> | | 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> |
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− | flux=10^(p0+p1*x+p2**x^2+p3*x^3), <br>
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− | with x=log10(stix_peak_counts*r^2)<br>
| + | [[File:Goes_background.png |600px|thumb|none| An example of estimated GOES flux background. ]] |
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− | where p0, p1, p2 are the parameters from the curve fit, peak_counts is the STIX QL LC peak
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− | counts and r is the distance between the Sun and solar orbiter in units of au. <br>
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− | The error of an estimated flux is considered to be the same as the error of its nearest data point.
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Latest revision as of 10:29, 21 January 2022
Scatter plot of STIX counts (4 - 10 keV) versus GOES and as well as a linear fit and a polynomial fit to the data.
The GOES flux of a solar flare is estimated using
flux=10^(p0+p1*x),
with x=log10(stix_peak_counts*r^2)
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.
An example of estimated GOES flux background.