Conference paper
Two-Fluid 2.5D MHD-Code for Simulations in the Solar Atmosphere
Isabell Piantschitsch
; IGAM/Institute of Physics, University of Graz, Graz, Austria
U. Amerstorfer
; IGAM/Institute of Physics, University of Graz, Graz, Austria
Julia Thalmann
; IGAM/Institute of Physics, University of Graz, Graz, Austria
Dominik Utz
; IGAM/Institute of Physics, University of Graz, Graz, Austria
Arnold Hanslmeier
; IGAM/Institute of Physics, University of Graz, Graz, Austria
Miroslav Barta
; Astronomical Institute of the Academy of Sciences, Ondřejov, Czech Republic
Stefan Thonhofer
; IGAM/Institute of Physics, University of Graz, Graz, Austria
Birgit Lemmerer
; IGAM/Institute of Physics, University of Graz, Graz, Austria
Abstract
We investigate magnetic reconnection due to the evolution of magnetic flux tubes in the solar chromosphere. We developed a new
numerical two-fluid magnetohydrodynamic (MHD) code which will perform a 2.5D simulation of the dynamics from the upper convection zone up to the transition region. Our code is based on the Total Variation Diminishing Lax-Friedrichs scheme and makes use of an alternating-direction implicit method, in order to accommodate the two spatial dimensions. Since we apply a two-fluid model for our simulations, the effects of ion-neutral collisions, ionization/recombination, thermal/resistive diffusivity and collisional/resistive heating are included in the code. As initial conditions for the code we use analytically constructed vertically open magnetic flux tubes within a realistic stratified atmosphere. Initial MHD tests have already shown good agreement with known results of numerical MHD test problems like e.g. the Orszag-Tang vortex test.
Keywords
MHD simulation; chromosphere; reconnection
Hrčak ID:
143598
URI
Publication date:
20.11.2014.
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