Moreton waves: numerical simulations and their comparison with observations

CÉCERE, M.

Potsdam

Seminario; Physics of the Sun Section, Leibniz-Institut für Astrophysik Potsdam; 2017

Moreton waves are large-scale perturbations propagating in the solar surface. However, there is a consensus thatthe Moreton waves originate at a coronal level. Coronal mass ejections (CMEs) and flares are impulsive coronalevents capable of producing large-scale coronal shocks and therefore they are potential triggers of Moreton waves.Nevertheless, not every CME or flares produce these chromospheric waves. To shed light on the capability of theCMEs and flares phenomena to drive a Moreton wave, we performe 2D compressible magnetohydrodynamicssimulations of several flare and CME configurations, where the chromosphere is considered in the computationaldomain. In 2015, we find that a flare ignited blast-wave or the expansion of the CME flanks are capable to reproducethe observations. In 2018, we find that only very impulsive CMEs, i.e. configurations with hot flux ropes andrelatively strong magnetic fields that lead to a flux rope overexpansion, could generate detectable chromosphericdisturbances. Finally, we show that all these scenarios, with a special enviroment, can account for the observedMoreton wave of the 2006 December 6 event.