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The red line is temperature and the blue is source separation, for different pairs of beams. We want to compute a running mean for this data and subtract it for all source separation values before taking our standard deviation.
- compute running mean
- subtract out
- separate sequence of 1000 images into 100 image sequences and see if the dome seeing decreases
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The computed running mean with a window of 20 points is shown in the figure above. We now take this mean and subtract from the y source separation values for beam pair 0.
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The new plot looks relatively similar to the previous 1000 image plot (shown below); the x pairs are much flatter
Old plot:
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Elana also had the idea to compare this with the ellipticity of our first batch of on-sky data points, so we can make a stronger argument that this dome seeing is directional.
Procedure
Galsim, make a box around each star to find the PSF
Rotate the ellipticity back around into the correct x,y frame
Coordinate transformation is the same as before to figure out the major/minor axes