Optimal Pre-Initial Conditions for Data-Driven MHD Simulations of Solar Active Regions

Details Optimal Pre-Initial Conditions for Data-Driven MHD Simulations of Solar Active Regions Optimal Pre-Initial Conditions for Data-Driven MHD Simulations of Solar Active Regions

Dec 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010agufmsh42a..04h&link_type=abstract

American Geophysical Union, Fall Meeting 2010, abstract #SH42A-04

Astronomy and Astrophysics

Astrophysics

[7524] Solar Physics, Astrophysics, And Astronomy / Magnetic Fields

Scientific paper

With the available high-quality photospheric vector magnetic field measurements returned by the Solar Dynamics Observatory (SDO), both for an active region and also possibly on a global scale, we present our approach of non-force-free extrapolation of the solar coronal magnetic field from vector magnetograms. In particular, we combine our analysis with data-driven MHD simulation of solar active regions that utilizes a vector magnetogram as part of the bottom boundary conditions. We also derive an approximation for the coronal plasma pressure distribution based on the extrapolated non-force-free magnetic field. We provide our extrapolated magnetic field and the corresponding plasma pressure estimate as initial input to the MHD system. Then several case studies with different initial plasma pressure estimates are presented. We show that our extrapolation result is a viable and optimal choice in terms of agreement with observed photospheric vector magnetogram as pre-initial conditions for data-driven self-consistent MHD simulation of solar active regions. We further discuss the potential application of the combined approach to the dynamic simulation of solar active region evolution.

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