Numerical modelling of filaments winking

ZURBRIGGEN, E.; CÉCERE, M.; KRAUSE, G.; COSTA, A.; SIEYRA, V.

Congreso; Towards Future Research on Space Weather Drivers; 2019

Moreton waves are uncommon large-scale propagating perturbations at solar chro-mospheric level, travelling distances of ≈500 Mm with speeds in the range of [500 ? 2000]km/s. After the occurrence of a Moreton event, some observations have reported great inten-sity oscillations emitted by surrounding flux ropes (Francile et al. 2013, A&A 552, A3); also,observations have suggested this flux rope wink is coincident with the passage of a Moretonwavefront not detectable at coronal heights. In a previous work, we have examined the capa-bility of a CME to drive a Moreton event by means of an unstable initial flux rope magneticconfiguration (Krause et al. 2018, MNRAS 474); now we study whether surrounding flux ropesvariable intensities are compatible with perturbations exerted by a Moreton wavefront passage,and whether this oscillating emissions are either caused by the flux rope oscillatory motions orby changes in their internal plasma-parameters. By means of 2D MHD simulations consideringthe chromosphere and a stratified corona, we model an initial pseudo-equilibrium flux ropemagnetic configuration, where observationally constrained different plasma-parameters? valuesand Moreton wavefront are analysed. The obtained results and comparison with observationsare presented.