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We performed magnetohydrodynamic simulation of a formation process of coronalmass ejections (CMEs), focusing on interaction (reconnection) between anejecting flux rope and its ambient field. We examined three cases withdifferent ambient fields: no ambient field, and cases with dipole field of twoopposite directions which are parallel and anti-parallel to that of the fluxrope surface. As a result, while the flux rope disappears in the anti-parallelcase, in other cases the flux ropes can evolve to CMEs and show differentamounts of rotation of the flux rope. The results imply that the interactionbetween an ejecting flux rope and its ambient field is an important process fordetermining CME formation and CME orientation, and also show that the amountand direction of magnetic flux within the flux rope and the ambient field arekey parameters for CME formation. Especially, the interaction (reconnection)plays a significant role to the rotation of the flux rope, with a processsimilar to "tilting instability" in a spheromak-type experiment of laboratoryplasma.

MHD Modeling for Formation Process of Coronal Mass Ejections: Interaction between Ejecting Flux Rope and Ambient Field