Magnetic diffusion and flare energy buildup

Details Magnetic diffusion and flare energy buildup Magnetic diffusion and flare energy buildup

Dec 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992soph..142..313w&link_type=abstract

Solar Physics (ISSN 0038-0938), vol. 142, no. 2, p. 313-325.

Physics

5

Force-Free Magnetic Fields, Magnetic Diffusion, Magnetic Energy Storage, Solar Corona, Solar Flares, Solar Magnetic Field, Electric Current, Photosphere, Solar Activity, Velocity Distribution

Scientific paper

Photospheric motion shears or twists solar magnetic fields to increase magnetic energy in the corona, because this process may change a current-free state of a coronal field to force-free states which carry electric current. This paper analyzes both linear and nonlinear 2D force-free magnetic field models and derives relations of magnetic energy buildup with photospheric velocity field. When realistic data of solar magnetic field and photospheric velocity field are used, it is found that 3-4 hours are needed to create an amount of free magnetic energy which is of the order of the current-free field energy. Furthermore, the paper studies situations in which finite magnetic diffusivities in photospheric plasma are introduced. The shearing motion increases coronal magnetic energy, while the photospheric diffusion reduces the energy. The variation of magnetic energy in the coronal region, then, depends on which process dominates.

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