IAFE   05512
INSTITUTO DE ASTRONOMIA Y FISICA DEL ESPACIO
Unidad Ejecutora - UE
congresos y reuniones científicas
Título:
Kelvin-Helmholtz instability driven by CMEs expanding in a turbulent medium
Autor/es:
GOMEZ, DANIEL; DELUCA, EDWARD; MININNI, PABLO
Lugar:
Boston
Reunión:
Congreso; 224th Meeting of the American Astronomical Society; 2014
Institución organizadora:
American Astronomical Society
Resumen:
Recent high resolution AIA/SDO images show clear evidence of the development of the Rayleigh-Taylor instability, as coronal mass ejections (CMEs) expand in the ambient corona. A large-scale magnetic field mostly tangential to the interface is observed, both on the CME and on the background sides. However, this magnetic field is not intense enough to quench the instability. The ambient corona is expected to be in a turbulent regime, and therefore the development of the Raleigh-Taylor instability can significantly differ from the one corresponding to a laminar medium.To study the evolution of the Rayleigh-Taylor instability in a turbulent background, we perform three-dimensional simulations of the magnetohydrodynamic equations. The instability is driven by a velocity profile tangential to the CME-corona interface, which we simulate through a hyperbolic tangent profile. The turbulent background is obtained by the application of a stationary stirring force. One of the outcomes of these simulations is the computation of the instability growth-rate for different values of the correlation length of the turbulence.