Observations in the Mg iλ5173 line. The top row correponds to Dopplergrams (calculated from images at ± 42 mÅ). The other panels, in descending order, show red wing images, λ − λ0 = 42, 238, and 878 mÅ, respectively. The images in the left column were restored with the flat-fielding scheme by Schnerr et al. (2011). Artifacts due to cavity errors appear as small-scale grains, clearly visible in panels a) and b). In contrast, no such errors are visible in the right column, corresponding to images restored with our new method.
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.