3 Observations
We used ASI images and N-S keogram to identify the detachment of arcs
based on visual inspection. Figure 1 shows the typical ASI images at
red-line (630.0 nm) and green-line (557.7 nm) for red arc (upper panel
A), red+green arc (middle panel B), and STEVE (bottom panel C).
Spectrally pure red-line emission is considered as red arcs, not
associated with simultaneous observation in the green-line (panel A).
The arc in red-line with simultaneous emission in green-line is referred
as red+green arc (panel B). STEVE is a narrow bright arc compared to
normal red arc, exhibiting wavy structure along the arc, and sometimes
also picket fence structure in the green-line (panel C).