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We use high time cadence images acquired by the STEREO EUVI and CORinstruments to study the evolution of coronal mass ejections (CMEs), from theirinitiation, through the impulsive acceleration to the propagation phase. For aset of 95 CMEs we derived detailed height, velocity and acceleration profilesand statistically analysed characteristic CME parameters: peak acceleration,peak velocity, acceleration duration, initiation height, height at peakvelocity, height at peak acceleration and size of the CME source region. TheCME peak accelerations derived range from 20 to 6800 m s^2 and are inverselycorrelated to the acceleration duration and to the height at peak acceleration.74% of the events reach their peak acceleration at heights below 0.5 Rsun. CMEswhich originate from compact sources low in the corona are more impulsive andreach higher peak accelerations at smaller heights. These findings can beexplained by the Lorentz force, which drives the CME accelerations anddecreases with height and CME size.

Impulsive acceleration of coronal mass ejections: I. Statistics and CME source region characteristics