NUMERICAL EVALUATIONS OF DIFFERENT MECHANISMS TO PRODECE LARGE-SCALE WAVES IN THE SOLAR CHROMOSPHERE

KRAUSE, GUSTAVO; CÉCERE, MARIANA; COSTA, ANDREA; ELASKAR, SERGIO

Córdoba

Congreso; ENIEF 2016; 2016

Asociación Argentina de Mecánica Computacional y UTN

In this work we examine the capability of two models to produce a Moreton wave, a typeof large-scale wave which travels on the solar chromosphere at speeds of the order of fast magnetosonicwaves. The first model consists in a blast-wave scenario associated with a flare event, which producesa very large release of energy in the form of a pressure pulse whose expansion causes a shock wavetravelling in the solar corona. The second model consists in a flux rope rise produced by a coronal massejection (CME), whose movement generates a bow-shock ascending in the corona. The effect of the bow-shock flanks on the chromosphere is believed by some authors to be responsible for the Moreton wavegeneration. The goal of this work is to analyze whether these models are capable of producing large-scale waves phenomena in the solar atmosphere. For this purpose we implement numerical simulationof each model using adequate parameters to represent the solar environment. The results are numericallyobtained by the use of the FLASH code, a powerful magnetohydrodynamics simulation tool capable ofhandling general compressible flow problems in many astrophysical environments, allowing for adaptivemesh refinement (AMR) and efficient parallel computing. The numerical results are compared withobservations of an actual Moreton event in order to evaluate if the local density enhancements on thechromosphere produced by each model are large enough to be captured by solar telescopes.