engleski

Dynamics of solar coronal eruptions

The kinematics of 87 solar eruptive events (flare sprays, eruptive prominences, and coronal transients) observed above the solar limb are studied. The data reveal a clear statistical trend for the highest measured value of the acceleration to be lower in the events taking place at a larger radial distance. The majority of events (84\%) show a phase of exponential-like growth of the velocity. The growth rate decreases with the height at which this regime sets in. A phase of constant acceleration was found only in 11\% of cases. In the postacceleration phase a constant velocity regime was found in 57\% of events. A considerable number of eruptions (32\%) exposed a deceleration, most often showing an exponential-like decay of the velocity. The related theoretical models are confronted with the observations, and the implications are discussed.

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