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

Luca Sorriso-Valvo, Vincenzo Carbone, Pierluigi Veltri, Valentina I. Abramenko, Alain Noullez, Hélène Politano, Annick Pouquet, Vasyl Yurchyshyn

Research output: Contribution to journalArticlepeer-review

16 Scopus citations

Abstract

The detection of magnetic field variations as a signature of flaring activity is one of the main goals in solar physics. Past efforts gave apparently no unambiguous observations of systematic changes. In the present study, we discuss recent results from observations that scaling laws of turbulent current helicity inside a given flaring active region change in response to large flares in that active region. Such changes can be related to the evolution of current structures by a simple geometrical argument, which has been tested using high Reynolds number direct numerical simulations of the MHD equations. Interpretation of the observed data within this picture indicates that the change in scaling behavior of the current helicity seems to be associated with a topological reorganization of the footpoint of the magnetic field loops, namely with the dissipation of small scales structures in turbulent media.

Original languageEnglish (US)
Pages (from-to)937-943
Number of pages7
JournalPlanetary and Space Science
Volume52
Issue number10
DOIs
StatePublished - Aug 2004

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

Keywords

  • Active regions
  • Flares

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