Fig. 5From: Validation of computed extreme ultraviolet emission spectra during solar flaresExample of flare ribbon observation. The flare ribbon observation by the SDO/AIA 1600 Å for the M9.9-class flare on January 1, 2014. The yellow contour indicates the region with an intensity 40 times greater than the standard deviation of the quiet region. The red arrow indicates the ribbon distance defined in this studyBack to article page