'Mdi magnetograms derived' presentation slideshows

A particularly obvious example of daily changing background noise level

Variance at Each Longitude. Variance at Each Latitude. Scale correction map for MDI magnetograms derived by Tran, Bertello, Ulrich, &Evans, ( Ap J Supp, 145:259, 2005 ) from Mt Wilson observations. A smoothed version is used to calibrate individual magnetograms.

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