Numerical modeling of coronal mass ejections based on various pre-event model atmospheres

Details Numerical modeling of coronal mass ejections based on various pre-event model atmospheres Numerical modeling of coronal mass ejections based on various pre-event model atmospheres

Jan 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994alab.reptv....s&link_type=abstract

Technical Report, Alabama Univ. Huntsville, AL United States

Computer Science

Magnetohydrodynamics, Solar Corona, Stellar Mass Ejection, Solar Activity, Boundary Conditions, Solar Magnetic Field, Coronal Loops, Coronal Holes, Stellar Models

Scientific paper

We examine how the initial state (pre-event corona) affects the numerical MHD simulation for a coronal mass ejection (CME). Earlier simulations based on a pre-event corona with a homogeneous density and temperature distribution at lower boundary (i.e. solar surface) have been used to analyze the role of streamer properties in determining the characteristics of loop-like transients. The present paper extends these studies to show how a broader class of global coronal properties leads not only to different types of CME's, but also modifies the adjacent quiet corona and/or coronal holes. We consider four pre-event coronal cases: (1) Constant boundary conditions and a polytropic gas with gamma = 1.05; (2) Non-constant (latitude dependent) boundary conditions and a polytropic gas with gamma = 1.05; (3) Constant boundary conditions with a volumetric energy source and gamma = 1.67; (4) Non-constant (latitude dependent) boundary conditions with a volumetric energy source and gamma = 1.67. In all models, the pre-event magnetic fields separate the corona into closed field regions (streamers) and open field regions. The CME's initiation is simulated by introducing at the base of the corona, within the streamer region, a standard pressure pulse and velocity change. Boundary values are determined using MHD characteristic theory. The simulations show how different CME's, including loop-like transients, clouds, and bright rays, might occur. There are significant new features in comparison to published results. We conclude that the pre-event corona is a crucial factor in dictating CME's properties.

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