  It is well known that there is temporal relationship between coronal mass
ejections (CMEs) and associated flares. The duration of the acceleration phase
is related to the duration of the rise phase of a flare. We investigate CMEs
associated with slow long duration events (LDEs), i.e. flares with the long
rising phase. We determined the relationships between flares and CMEs and
analyzed the CME kinematics in detail. The parameters of the flares (GOES flux,
duration of the rising phase) show strong correlations with the CME parameters
(velocity, acceleration during main acceleration phase and duration of the CME
acceleration phase). These correlations confirm the strong relation between
slow LDEs and CMEs. We also analyzed the relation between the parameters of the
CMEs, i.e. a velocity, an acceleration during the main acceleration phase, a
duration of the acceleration phase, and a height of a CME at the end of the
acceleration phase. The CMEs associated with the slow LDEs are characterized by
high velocity during the propagation phase, with the median equal 1423 km/s. In
half of the analyzed cases, the main acceleration was low (a<300 m/s^2), which
suggests that the high velocity is caused by the prolongated acceleration phase
(the median for the duration of the acceleration phase is equal 90 minutes).
The CMEs were accelerated up to several solar radii (with the median 7 Rsun),
which is much higher than in typical impulsive CMEs. Therefore, slow LDEs may
potentially precede extremely strong geomagnetic storms. The analysis of slow
LDEs and associated CMEs may give important information for developing more
accurate space weather forecasts, especially for extreme events.
