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We propose a mechanism for the excitation of large-scale quasi-periodicfast-propagating magnetoacoustic (QFP) waves observed on both sides of thecoronal mass ejection (CME). Through a series of numerical experiments, wesuccessfully simulated the quasi-static evolution of the equilibrium locationsof the magnetic flux rope in response to the change of the background magneticfield, as well as the consequent loss of the equilibrium that eventually givesrise to the eruption. During the eruption, we identified QFP waves propagatingradially outwards the flux rope, and tracing their origin reveals that theyresult from the disturbance within the flux rope. Acting as an imperfectwaveguide, the flux rope allows the internal disturbance to escape to theoutside successively via its surface, invoking the observed QFP waves.Furthermore, we synthesized the images of QFP waves on the basis of the datagiven by our simulations, and found the consistence with observations. Thisindicates that the leakage of the disturbance outside the flux rope could be areasonable mechanism of QFP waves.

Excitation of quasi-periodic fast-propagating waves in the early stage of the solar eruption