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Predictions of Energy and Helicity in Four Major Eruptive Solar Flares

  • SOLAR FLARE MAGNETIC FIELDS AND PLASMAS
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Abstract

In order to better understand the solar genesis of interplanetary magnetic clouds (MCs), we model the magnetic and topological properties of four large eruptive solar flares and relate them to observations. We use the three-dimensional Minimum Current Corona model (Longcope, 1996, Solar Phys. 169, 91) and observations of pre-flare photospheric magnetic field and flare ribbons to derive values of reconnected magnetic flux, flare energy, flux rope helicity, and orientation of the flux-rope poloidal field. We compare model predictions of those quantities to flare and MC observations, and within the estimated uncertainties of the methods used find the following: The predicted model reconnection fluxes are equal to or lower than the reconnection fluxes inferred from the observed ribbon motions. Both observed and model reconnection fluxes match the MC poloidal fluxes. The predicted flux-rope helicities match the MC helicities. The predicted free energies lie between the observed energies and the estimated total flare luminosities. The direction of the leading edge of the MC’s poloidal field is aligned with the poloidal field of the flux rope in the AR rather than the global dipole field. These findings compel us to believe that magnetic clouds associated with these four solar flares are formed by low-corona magnetic reconnection during the eruption, rather than eruption of pre-existing structures in the corona or formation in the upper corona with participation of the global magnetic field. We also note that since all four flares occurred in active regions without significant pre-flare flux emergence and cancelation, the energy and helicity that we find are stored by shearing and rotating motions, which are sufficient to account for the observed radiative flare energy and MC helicity.

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  1. Maria D. Kazachenko

    Present address: Space Sciences Laboratory, University of California, Berkeley, CA, USA

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  1. Montana State University, Bozeman, MT, USA

    Maria D. Kazachenko, Richard C. Canfield, Dana W. Longcope & Jiong Qiu

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Solar Flare Magnetic Fields and Plasmas

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Kazachenko, M.D., Canfield, R.C., Longcope, D.W. et al. Predictions of Energy and Helicity in Four Major Eruptive Solar Flares. Sol Phys 277, 165–183 (2012). https://doi.org/10.1007/s11207-011-9786-6

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