Paper:	Post-hoc Derivation of MDI Flat Fields
Volume:	416, Solar-Stellar Dynamos as Revealed by Helio- and Asteroseismology: GONG 2008/SOHO 21
Page:	239
Authors:	Potts, H. E.; Diver, D. A.
Abstract:	We present a new method for deriving flat fields for high resolution MDI continuum data, using analysis of existing continuum and magnetogram data sets. This method allows us to reduce the residual flat field error on level 1.5/1.8 data by around a factor of 10, enough to significantly change the results from motion tracking and feature recognition algorithms. One significant advantage of this method is that it can be done retrospectively using archived data, without requiring any special satellite operations.

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