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Overview of the annulus method for obtaining kinematics measurements from AIA observations. (A) A full-Sun AIA base difference image with an annular sector outlining the portion of the image that is extracted by the procedure. The white rectangle outlines the AIA field of view. (B) The corresponding annulus image, with the white curve near the top indicating the extent of data pixels. Black vertical and horizontal lines denote the pixels along which radial and tangential kinematics measurements will be made, for context. (C) Stack plot of pixels along the radial direction. Green ‘+’ symbols show intensity peaks, green lines show the radial peak-to-front distance. The vertical white lines denote the start and end times of OCBF tracking in the AIA FOV.
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