INVESTIGADORES
ELASKAR sergio Amado
artículos
Título:
Numerical simulation of the internal plasma dynamics of post-flare loops
Autor/es:
FERÁNDEZ, CARLOS; COSTA, ANDREA; ELASKAR, SERGIO; SCHULZ, WALKIRIA
Revista:
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
Editorial:
WILEY-BLACKWELL PUBLISHING, INC
Referencias:
Año: 2009 vol. 400 p. 1821 - 1828
ISSN:
0035-8711
Resumen:
We integrate the magnetohydrodynamic (MHD) ideal equations of a slender flux tube tosimulate the internal plasma dynamics of coronal post-flare loops.We study the onset and evolution of the internal plasma instability to compare with observations and to gain insight intophysical processes and characteristic parameters associated with flaring events. The numericalapproach uses a finite-volume Harten–Yee total variation diminishing scheme to integrate theone-dimensional 1/2 MHD equations specially designed to capture supersonic flow discontinuities.We could reproduce the observational sliding down and upwardly propagating of brightening features along magnetic threads of an event occurred on 2001 October 1.We show that high-speed downflow perturbations, usually interpreted as slow magnetoacoustic waves,could be better interpreted as slow magnetoacoustic shock waves. This result was obtainedconsidering adiabaticity in the energy balance equation. However, a time-dependent forcingfrom the basis is needed to reproduce the reiteration of the event which resembles observationalpatterns – commonly known as quasi-periodic pulsations (QPPs)– which are related with large-scale characteristic longitudes of coherence. This result reinforces the interpretationthat the QPPs are a response to the pulsational flaring activity.