tokens: The imaging data used in this work was provided courtesy of the NASA/ SDO and the AIA and HMI science teams. The OMNI data were obtained from the GSFC/SPDF OMNIWeb interface at https://omniweb.gsfc.nasa.gov . The authors thank the Helioviewer project for providing easy browsing access to many solar imaging data sets. The authors are also grateful to the anonymous referee for numerous helpful comments that improved the final paper.
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