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Coronal magnetic flux ropes are generally considered to be the core structureof large-scale solar eruptions. Recent observations found that solar eruptionscould be initiated by a sequence of "flux feeding," during which chromosphericfibrils rise upward from below, and merge with a pre-existing prominence.Further theoretical study has confirmed that the flux feeding mechanism isefficient in causing the eruption of flux ropes that are wrapped by bald patchseparatrix surfaces. But it is unclear how flux feeding influences coronal fluxropes that are wrapped by hyperbolic flux tubes (HFT), and whether it is ableto cause the flux-rope eruption. In this paper, we use a 2.5-dimensionalmagnetohydrodynamic model to simulate the flux feeding processes in HFTconfigurations. It is found that flux feeding injects axial magnetic flux intothe flux rope, whereas the poloidal flux of the rope is reduced after fluxfeeding. Flux feeding is able to cause the flux rope to erupt, provided thatthe injected axial flux is large enough so that the critical axial flux of therope is reached. Otherwise, the flux rope system evolves to a stableequilibrium state after flux feeding, which might be even farther away from theonset of the eruption, indicating that flux feeding could stabilize the ropesystem with the HFT configuration in this circumstance.

How flux feeding causes eruptions of solar magnetic flux ropes with the hyperbolic flux tube configuration?