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We investigate the onsets of three consecutive coronal mass ejection (CME)eruptions in 12 hours from a large bipolar active region (AR) observed by SDO,STEREO, RHESSI, and GOES. Evidently, the AR initially had a triple-deckerconfiguration: three flux ropes in a vertical stack above the polarityinversion line (PIL). Upon being bumped by a confined eruption of the middleflux rope, the top flux rope erupts to make the first CME and its accompanyingAR-spanning flare arcade rooted in a far-apart pair of flare ribbons. Thesecond CME is made by eruption of the previously-arrested middle flux rope,which blows open the flare arcade of the first CME and produces a flare arcaderooted in a pair of flare ribbons closer to the PIL than those of the firstCME. The third CME is made by blowout eruption of the bottom flux rope, whichblows open the second flare arcade and makes its own flare arcade and pair offlare ribbons. Flux cancellation observed at the PIL likely triggers theinitial confined eruption of the middle flux rope. That confined eruptionevidently triggers the first CME eruption. The lid-removal mechanism instigatedby the first CME eruption plausibly triggers the second CME eruption. Furtherlid removal by the second CME eruption plausibly triggers the final CMEeruption.

Sequential Lid Removal in a Triple-Decker Chain of CME-Producing Solar Eruptions