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We report on the energetics of the 2012 March 12 polar coronal mass ejection(CME) originating from a southern latitude of ~60o. The polar CME is similar tolow-latitude CMEs in almost all respects: three-part morphology, post eruptionarcade (PEA), CME and filament kinematics, CME mass and kinetic energy, and therelative thermal energy content of the PEA. From polarized brightness images,we estimate the CME mass, which is close to the average mass of low-latitudeCMEs. The CME kinetic energy (3.3x1030 erg) is also typical of the generalpopulation of CMEs. From photospheric magnetograms, we estimate the free energy(1.8x1031 erg) in the polar crown source region, which we find is sufficient topower the CME and the PEA. About 19% of the free energy went into the CMEkinetic energy. We compute the thermal energy content of the PEA (2.3x1029 erg)and find it to be a small fraction (6.8%) of the CME kinetic energy. Thisfraction is remarkably similar to that in active region CMEs associated withmajor flares. We also show that the 2012 March 12 is one among scores of polarCMEs observed during the maximum phase of cycle 24. The cycle 24 polar crownprominence eruptions have the same rate of association with CMEs as those fromlow-latitudes. This investigation supports the view that all CMEs aremagnetically propelled from closed field regions, irrespective of theirlocation on the Sun (polar crown filament regions, quiescent filament regionsor active regions).

Kinematic and Energetic Properties of the 2012 March 12 Polar Coronal Mass Ejection