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We present a comprehensive analysis of a particular class of coronal massejection (CME) event, called streamer-blowout CME (SBOs). The events arecharacterized by a gradual swelling of the overlying streamer, lasting hours todays, followed by a slow, wide CME, generally exhibiting a 3-part structure,which leaves the streamer significantly depleted in its wake. We identify 909SBO events in the LASCO/C2 observations between 1996 and 2015. The averageblowout lasts for 40.5 hours but the evacuation can take days for some events.SBO-CMEs are wider and more massive than the average CME. Their propertiesgenerally vary during and between solar cycles. Their minimum (maximum) monthlyoccurrence rate of one (six) events in cycle 23 has doubled in cycle 24---aprobable manifestation of the weaker global fields in the current cycle. Thelocations of SBOs follow the tilt of the global dipole (but not from 2014onwards), do not correlate with sunspot numbers and exhibit flux ropemorphology at a much higher rate (61%) than regular CMEs (40%). We propose thatthese characteristics are consistent with SBOs arising from extended polarityinversion lines outside active regions (e.g. quiet sun and polar crownfilaments) through the release, via reconnection, of magnetic energy, likelyaccumulated via differential rotation.

Streamer Blowout Coronal Mass Ejections: Their Properties and Relation to the Coronal Magnetic Field Structure