Difference between revisions of "GOES Flux vs STIX counts"

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[[File:Goes-stix-flux.png|800px|thumb|none| Left: Histogram of STIX counts versus GOES flux in log-log scale.
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[[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.  ]]
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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. ]]
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The GOES flux of a solar flare is estimated using<br>
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flux=10^(p0+p1*x), <br>
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with x=log10(stix_peak_counts*r^2)<br>
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where p0, p1 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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{| class="wikitable"
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[[File:Goes_background.png |600px|thumb|none| An example of estimated GOES flux background. ]]
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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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! 1.525 || -6.25125 || na
 
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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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| 2.305 || -6.57996 || 0.200228
 
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|-
 
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| 2.435 || -6.47682 || 0.223041
 
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| 2.565 || -6.46797 || 0.216562
 
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| 2.695 || -6.41793 || 0.27564
 
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| 2.825 || -6.36375 || 0.223797
 
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| 2.955 || -6.3481 || 0.268878
 
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| 3.085 || -6.24556 || 0.246008
 
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| 3.215 || -6.23418 || 0.235726
 
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| 3.345 || -6.15042 || 0.320178
 
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| 3.475 || -6.1948 || 0.240977
 
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| 3.605 || -6.09313 || 0.25082
 
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| 3.735 || -5.96493 || 0.265629
 
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| 3.865 || -5.93862 || 0.35869
 
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| 3.995 || -5.83875 || 0.146257
 
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| 4.125 || -5.85643 || 0.179611
 
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| 4.255 || -5.83875 || 0.169521
 
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| 4.385 || -5.59125 || 0.124728
 
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| 4.515 || -5.37125 || 0.0388909
 
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| 4.645 || -5.4675 || 0.227187
 
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| 4.775 || -5.40563 || 0.187903
 
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| 5.165 || -4.76625 || 0.0825
 
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| 5.295 || -4.62875 || 0.406033
 
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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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|}
 

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.
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