Keywords :
Sun coronal mass ejections (CMEs) - solar-terrestrial relations
Abstract:Predicting transit times (TT) of coronal mass ejections (CMEs) from their initial parameters is a very important subject, not only from the scientific perspective, but also because CMEs represent a hazard for human technology. We used a neural network (NN) to analyse TT for 153 events with only two input parameters: initial velocity of the CME, v, and central meridian distance, CMD, of its associated flare. We found that transit time dependence on v is showing a typical drag-like pattern in the solar wind. The results show that the speed at which acceleration by drag changes to deceleration is v~500km/s. TT are also found to be shorter for CMEs associated with flares on the western hemisphere than those originating on the eastern side of the
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