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Many observations show that coronal holes (CHs) deviate coronal massejections (CMEs) away from them. However, there are some peculiar eventsreported where the opposite occurs. To contribute to a space weather forecastefforts, in relation to the prediction of CME trajectories, we study theinteraction between flux ropes (FRs) and CHs through numerical simulations. Weperform 2.5D numerical simulations where FRs and CHs interact with differentrelative polarity configurations. We also reconstruct the trajectory andmagnetic environment of a peculiar event occurred on 30 April 2012. Thenumerical simulations indicate that at low coronal levels, depending on therelative magnetic field polarity between the FR and the CH, the deflection willbe attractive, i.e. the FR moves towards the CH (for anti-aligned polarities)or repulsive, i.e. the FR moves away to the CH (for aligned polarities). Thisis likely due to the formation of vanishing magnetic field regions or nullpoints, located between the FR and the CH or, at the other side of the FR,respectively. The analysed observational event shows a double-deflection, firstdeparting from the radial direction by approaching the CH and then moving awayfrom it suggesting that the trajectory could result from a magneticconfiguration with an anti-aligned polarity. We numerically reproduce thedouble deflection of the observed event, providing support to this conjecture.

Polarity relevance in flux rope deflections triggered by coronal holes