Observational results and their physical implications on magnetic field shear in relation to flares are presented. The observed character of magnetic shear and its involvement in the buildup and release of flare energy are reviewed. It is pointed out that the magnetic field in active regions can become sheared by several processes, including shear flow in the photosphere, flux emergence, magnetic reconnection, and flux submergence. Modeling studies of the buildup of stored magnetic energy by shearing are reported which show ample energy storage for flares. Observational evidence is presented that flares are triggered when the field shear reaches a critical degree, in qualitative agreement with some theoretical analyses of sheared force-free fields. Finally, a scenario is outlined for the class of flares resulting from large-scale magnetic shear; the overall instability driving the energy release results from positive feedback between reconnection and eruption of the sheared field.


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    Titel :

    The role of magnetic field shear in solar flares


    Beteiligte:
    Hagyard, M. J. (Autor:in) / Moore, R. L. (Autor:in) / Emslie, A. G. (Autor:in)

    Erschienen in:

    Erscheinungsdatum :

    1984-01-01



    Medientyp :

    Sonstige


    Format :

    Keine Angabe


    Sprache :

    Englisch


    Schlagwörter :


    The role of magnetic field shear in solar flares

    Hagyard, M.J. / Moore, R.L. / Emslie, A.G. | Elsevier | 1984


    Magnetic field reconnection in solar and stellar flares

    Kundu, M.R. / White, S.M. | Elsevier | 1990


    Magnetic Models of Solar Flares

    Mclntosh, Patrick S. / Dryer, Murray | AIAA | 1972


    Solar Flares

    S. Savage | NTIS | 2017


    Solar Flares

    Savage, Sabrina | NTRS | 2017