CME VELOCITIES, ACCELERATIONS, WIDTHS AND POSITIONS IN THE ASCENDING PHASE OF THE SOLAR CYCLE 23 (1996-2001)

摘要

An analysis of the coronal mass ejections (CMEs) during the ascending phase of solar cycle 23 (1996-2001) is performed; we study velocities, accelerations, widths and heliocentric latitude of emergence (position angle), their variation with time, as well as possible interdependences among them. The data set comes from the observations of CMEs by the SOHO LASCO C2 or C3 coronographs. An increase of the average CME velocity is found from solar minimum to solar maximum. The average acceleration however remains close to zero through the observation period, yet the standard deviation of the distribution of CME accelerations increases as the CME "ejection rate" increases with increasing solar activity. The average width is almost constant, while its standard deviation increases drastically.