Are CMEs capable to produce Moreton waves? A case study: the December 06, 2006 event

KRAUSE, G., CÉCERE, M., ZURBRIGGEN, E., COSTA, A., FRANCILE, C., ELASKAR, S.

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY

WILEY-BLACKWELL PUBLISHING, INC

Lugar: Londres; Año: 2017

0035-8711

Considering the chromosphere and a stratified corona, we examine by performing 2D compressible MHD simulations, the capability of a CME scenario to drive a Moreton wave. We find that given a typical flux rope (FR) magnetic configuration, in initial pseudo-equilibrium, the larger the magnetic field and the lighter (and hotter) the FR, the larger the amplitude and the speed of the chromospheric disturbance, which eventually becomes a Moreton wave. We present arguments to explain why Moreton waves are much rarer than CME occurrences. In the frame of the present model, we explicitly exclude the action of flares that could be associated with the CME. Analysing Mach number we find that only fast magnetosonic shock waves will be able to produce Moreton events. In these cases an overexpansion of the FR is always present and it is the main responsible for the Moreton generation. Finally, we show that this scenario can give account of the Moreton wave of the December 06, 2006 event.