Inferring Small-Scale Flatfields from Solar Rotation |
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| Authors: | R Wachter J Schou |
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| Institution: | (1) Hansen Experimental Physics Laboratory, 452 Lomita Mall, Stanford, CA 94305-4085, USA |
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| Abstract: | We present a method to infer small-scale flatfields for imaging solar instruments using only regular-observation intensity
images with a fixed field of view. The method is related to the flatfielding method developed by Kuhn, Lin, and Loranz (Publ. Astron. Soc. Pac. 103, 1097 – 1108, 1991), but does not require image offsets. Instead, it takes advantage of the fact that the solar image is changing in the CCD
reference frame due to solar rotation. We apply the method to data sets of MDI filtergrams and compare the results to flat
fields derived with other methods. Finally, we discuss the planned implementation of this method in the data processing for
Helioseismic and Magnetic Imager on the Solar Dynamics Observatory. |
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| Keywords: | Helioseismology observations Instrumental effects Cosmic rays solar Cosmic rays galactic |
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