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Astron. Astrophys. 334, L57-L60 (1998)

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Letter to the Editor

Does the photospheric current take part in the flaring process?

V.I. Abramenko 1, V.B. Yurchishin 1 and V. Carbone 2, 3

1 Crimean Astrophysical Observatory, Nauchny, Ukraine
2 Dipartimento di Fisica, Universitá della Calabria, I-87036 Roges di Rende, Italy
3 Istituto Nazionale di Fisica per la Materia, Unitá di Cosenza, I-87036 Roges di Rende, Italy

Received 2 October 1997 / Accepted 17 March 1998

Abstract

On the basis of vector magnetograms of two flaring active regions (ARs) we analyze the scaling behavior of the current helicity [FORMULA] in the photosphere. The signed measure so obtained possesses a well pronounced sign-singularity in the range of scales from more than [FORMULA] Km down to the resolution limit of observations. We found that during the flaring process there is a signature both of a reorganization of the current helicity in the photosphere and of a strong magnetic energy dissipation of the photospheric magnetic field.

Key words: solar flares – scaling laws – turbulence

Send offprint requests to: V. Carbone

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© European Southern Observatory (ESO) 1998

Online publication: May 15, 1998

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