File:Diagram reintpret sads sadls.png

(a) Based on new evidence, the interpretation of SADs as the cross-sections of large, evacuated retracting flux tubes is no longer supported. Rather, they appear to be the wakes of much thinner shrinking loops. (b) Only shrinking loops are observed during the early phase of the eruptive event while SADs become apparent after there is a significant increase in hot plasma (c), presumably surrounding the current sheet, in the supra-arcade region. Note that the viewing orientation does not need to change to observe the two features; however, the increase in supra-arcade plasma is necessary to observe SADs (i.e., the wakes).]