SDO/HMI and STEREO-B/EUVI observations of the May 9, 2011 eruptive flare. Top panels: the pre-flare sigmoid and filament in EUV, and its magnetic environment three weeks before and one week after the flare. Bottom panels: formation of double J-shaped ribbons and strong-to-weak shear transition in the post-flare loops. The field-of-view is indicated by the white dashed rectangle in the top panel. The yellow line indicates the average orientation of the PIL and the colored marks indicate examples of loop footpoints, both being used to estimate the shear angles.
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