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Elsevier, Planetary and Space Science, 10(52), p. 937-943

DOI: 10.1016/j.pss.2004.02.006

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Topological changes of the photospheric magnetic field inside active regions: a prelude to flares

Journal article published in 2002 by Luca Sorriso-Valvo ORCID, Vincenzo Carbone ORCID, Valentina I. Abramenko ORCID, Pierluigi Veltri, Alain Noullez, Hélène Politano, Annick Pouquet, Vasyl Yurchyshyn
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This paper is available in a repository.

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Abstract

The observations of magnetic field variations as a signature of flaring activity is one of the main goal in solar physics. Some efforts in the past give apparently no unambiguous observations of changes. We observed that the scaling laws of the current helicity inside a given flaring active region change clearly and abruptly in correspondence with the eruption of big flares at the top of that active region. Comparison with numerical simulations of MHD equations, indicates that the change of scaling behavior in the current helicity, seems to be associated to a topological reorganization of the footpoint of the magnetic field loop, namely to dissipation of small scales structures in turbulence. It is evident that the possibility of forecasting in real time high energy flares, even if partially, has a wide practical interest to prevent the effects of big flares on Earth and its environment.