Magnetic Energy Storage in Coronal Active Regions

Details Magnetic Energy Storage in Coronal Active Regions Magnetic Energy Storage in Coronal Active Regions

May 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011spd....42.1803w&link_type=abstract

American Astronomical Society, SPD meeting #42, #18.03; Bulletin of the American Astronomical Society, Vol. 43, 2011

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Scientific paper

We consider magnetic energy storage in a force-free coronal model that simulates an active region by superposing a strong, localized magnetic bipole on a global background dipole. As we found earlier for dipolar and quadrupolar boundary conditions, our solutions develop detached flux ropes, whose energy can exceed that of the corresponding open field; this excess energy is available to power eruptive events such as coronal mass ejections. Our earlier work, and that of others on related magnetic configurations, has generally yielded excess energies of at most approximately 25 percent of the corresponding potential-field energy. Our new active-region models greatly exceed that value, with stressed force-free fields whose energy excess above the open-field state can be well over 100 percent of the energy stored in the associated potential field. Moving the model active region poleward increases the maximum value of this excess stored energy.
This work is funded by NSF grant AGS0940503 to Middlebury College.

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