The Interaction of Two Coronal Mass Ejections: Influence of Relative Orientation

摘要: We report on a numerical investigation of two coronal mass ejections (CMEs) which interact as they propagate in the inner heliosphere. focus effect orientation CMEs relative to each other by performing four different simulations with axis second CME rotated 90 degrees from one simulation next. Each magneto-hydrodynamic (MHD) is performed three dimensions (3-D) Space Weather Modeling Framework (SWMF) an idealized setting reminiscent solar minimum conditions. extract synthetic satellite measurements during and after interaction compare cases. also analyze kinematics CMEs, including evolution their widths aspect ratios. find that first contracts radially result all cases, but amount subsequent radial expansion depends CMEs. Reconnection between ejecta interplanetary magnetic field (IMF) determines type structure resulting interaction. When high inclination respect ecliptic overtakes low inclination, it possible create compound event smooth rotation vector over more than 180 degrees. Due reconnection, only appears extended "tail", may be mistaken for glancing encounter isolated CME. This configuration differs significantly usually studied multiple-magnetic cloud event, we found associated same orientation.