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A Three-Dimensional Magnetohydrodynamic (MHD) Model of Active Region Evolution

Published online by Cambridge University Press:  03 June 2005

S. T. Wu ,
A. H. Wang  and
D. A. Falconer
S. T. Wu
Affiliation:
Center for Space Plasma and Aeronomic Research, University of Alabama in Huntsville, Huntsville, AL 35899 USA email: [email protected] Department of Mechanical and Aerospace Engineering, University of Alabama in Huntsville, Huntsville, AL 35899 USA email: [email protected]
A. H. Wang
Affiliation:
Center for Space Plasma and Aeronomic Research, University of Alabama in Huntsville, Huntsville, AL 35899 USA email: [email protected]
D. A. Falconer
Affiliation:
Department of Physics, University of Alabama in Huntsville, Huntsville, AL 35899 USA email: [email protected] XD12, NASA/Marshall Space Flight Center, Huntsville, AL 35812 USA
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Abstract

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A three-dimensional, time-dependent, magnetohydrodynamic (MHD) model is constructed for the study of active region (AR) evolution. The new physics included in this model is differential rotation, meridional flow, effective diffusion and cyclonic turbulence effects, which means, that the photospheric shear is automatically generated instead of prescribed as is usually done for modeling. To benchmark this newly developed model, we have used observed active region NOAA/AR-8100 (October 29 - November 3, 1997) to verify the model by computation of the total magnetic flux and magnetic field maps of that active region. Then, we apply this model to compute the non-potentiality magnetic field parameters for possible coronal mass ejection production. These parameters are: (i) magnetic flux content ($\Phi$), (ii) the length of strong shear, strong-field main neutral line, ($L_{ss}$), (iii) the net electric current ($I_N$) and (iv) the flux normalized measure of the field twist ($\alpha$ = $\mu$$\frac{I_N}{\Phi}$). These parameters are compared with the measured values which showed remarkable agreement.To search for other articles by the author(s) go to: http://adsabs.harvard.edu/abstract_service.html

Keywords

Sun:Active RegionSun:MHDSun:Coronal Mass Ejections (CMEs)Sun:FlaresSun:Magnetic Fields
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 2004 , Issue IAUS226 , September 2004 , pp. 291 - 301
Copyright
© 2005 International Astronomical Union