Physics
Scientific paper
Dec 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agufmsh33b0403j&link_type=abstract
American Geophysical Union, Fall Meeting 2006, abstract #SH33B-0403
Physics
7509 Corona, 7524 Magnetic Fields, 7529 Photosphere, 7594 Instruments And Techniques
Scientific paper
We developed a new approach to deriving three-dimensional non-force free coronal magnetic field structures from vector photospheric magnetogram, based on the principle of Minimum Dissipation Rate (MDR). In analogy to the principle of minimum energy, which yields a linear (constant α) force-free magnetic field, the MDR gives a more general non-force free magnetic field with flow. Its solution can be expressed as a linear superposition of two linear force-free fields. The parameter, α, for each of the two linear force free fields, can be determined by optimizing the requirement that the recovered transverse magnetic field components as the superposition of the corresponding components of the two linear force free fields agree with the observed ones at the photospheric level. A preliminary test case study of an analytic non-force free field model illustrated the feasibility of the method. We further apply it to real magnetograph measurements of solar active regions to assess the relevant magnetic energy and relative helicity content.
Choudhary Debi Prasad
Dasgupta Basudeb
Hu Qiang
Janaki M.
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