2015-02-16T15:36:19.000Z http://sot.lmsal.com Ted Tarbell LMSAL http://lmsal.com 3251 Hanover Rd, O/ADBS, B/252, Palo Alto, CA, 94304 +1-650-424-2400 tarbell@lmsal.com Hinode SOT Yasuda Yasuda Green (RCO) 0 0 null HOP 269 PR PR Prominence 1 918 -170 0 0 2015-02-15T23:36:00.000Z 2015-02-16T01:20:00.000Z 918 -170 Prominence-Coronal Cavity Systems Ca H 16 s 2kx2k 2x2 1200ms Q90 ROI3 A Prominence-Coronal Cavity system (PCC) is a large-scale structure in the solar corona that consists of a dense, cool prominence surrounded by a low-density, hot coronal cavity. PCCs are likely manifestations of helical magnetic flux ropes located on the quiet Sun away from active regions (ARs). Their significance lies in the fact that eruptions of PCCs constitute ~40% of all coronal mass ejections (CMEs; Gopalswamy 2006). Therefore, understanding the formation, evolution, and eruption of PCCs is critical to probing the underlying physics of CMEs, a fundamental open question in solar physics.