Physics
Scientific paper
Dec 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agufmsh21a1586a&link_type=abstract
American Geophysical Union, Fall Meeting 2008, abstract #SH21A-1586
Physics
7509 Corona, 7511 Coronal Holes, 7524 Magnetic Fields, 7526 Magnetic Reconnection (2723, 7835)
Scientific paper
We have developed a 2.5D MHD code designed to study how the solar wind influences the evolution of transient events in the solar corona and inner heliosphere. The code includes the effects of thermal conduction, coronal heating and radiative cooling. Thermal conduction is assumed to be magnetic field- aligned in the inner corona and smoothly transitions to a collisionless formulation in the outer corona. In addition, we have developed a stable method to handle field-aligned conduction around magnetic null points. The inner boundary is placed in the transition region, and the mass flux across the boundary is determined from 1-D field aligned characteristics. We have developed a minimal velocity change condition which is used to stabilize the mass fluxes at the inner boundary. The 2.5D nature of this code makes it ideal for parameter studies not yet possible with 3D codes. We designed this code to be used by non-modeling experts and have made it publicly available as a tool for the community. To this end we have developed a graphical user interface which aids in the selection of options appropriate for the desired simulation and a graphical interface which can process and visualize the data produced by the simulation. As an example, we show a simulation of a dipole field stretched into a helmet streamer by the solar wind. Plasmoids periodically erupt from the streamer, and we perform a parameter study how the frequency and location of these eruptions changed in response to different levels of coronal heating. As a further example, we show the solar wind stretching a compact multi-polar flux system. This flux system will be used study breakout coronal mass ejections in the presence of the solar wind.
Allred Joel C.
MacNeice Peter J.
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