Transient Artifacts in SDO/HMI Flare Observations

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Scientific paper

The Helioseismic and Magnetic Imager (HMI) on SDO provides a new tool for the systematic observation of white-light flares, including Doppler and magnetic information as well as continuum. In our initial analysis of the highly impulsive gamma-ray flare SOL2010-06-12T00:57 (Martinez-Oliveros et al. 2011), we detected an apparently artifactual blue shift in the two footpoint sources. We have now deployed the PASCAL algorithm for the same flare as viewed in GONG++ data. This algorithm makes it possible to obtain much better photometry (plus Doppler and magnetic measurements) from the ground-based data. Using GONG++ we have demonstrated the artifactual nature of the apparent blueshift, finding instead weak redshifts at the foopoints. We discuss the flare physics associated with these observations and describe the use of PASCAL (with GONG++ or other ground-based data) as a complement to the systematic SDO data.

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