Open AccessDynamics of solar coronal eruptions
Author(s) -
Vršnak Bojan
Publication year - 2001
Publication title -
journal of geophysical research: space physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.67
H-Index - 298
eISSN - 2156-2202
pISSN - 0148-0227
DOI - 10.1029/2000ja004007
Subject(s) - solar prominence , physics , acceleration , astrophysics , solar flare , flare , coronal mass ejection , phase (matter) , kinematics , exponential decay , solar wind , plasma , classical mechanics , quantum mechanics , magnetic field , nuclear physics
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.