Spatio-temporal dynamics of magnetic fields in the photosphere and flaring productivity of active regions

Details Spatio-temporal dynamics of magnetic fields in the photosphere and flaring productivity of active regions Spatio-temporal dynamics of magnetic fields in the photosphere and flaring productivity of active regions

May 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005agusmsh53b..04a&link_type=abstract

American Geophysical Union, Spring Meeting 2005, abstract #SH53B-04

Physics

3250 Fractals And Multifractals, 7519 Flares, 7524 Magnetic Fields, 7839 Nonlinear Phenomena, 7863 Turbulence

Scientific paper

The role of spatio-temporal dynamics of the photospheric magnetic flux tubes in processes of energy built-up and energy release seems to be a subject of much controversy. To provide an insight into the problem, we propose to study the turbulence state, the multifractality and the fragmentation process in the photospheric magnetic structures and examine their relationship with the flare activity of different active regions (ARs). By calculating magnetic power spectra and structure functions of the line-of-sight magnetograms, as well as distribution functions of the the magnetic flux in magnetic elements, we found that parameters of these functions correlate with the flare productivity of an AR. Namely, flare-productive ARs display non-stationary non-homogeneous turbulent regime, high degree of multifractality and very intensive fragmentation of magnetic elements. On the contrary, for flare-quiet ARs we found a Kolmogorov-type homogeneous stationary turbulent regime, nearly monofractal structure of the field and low fragmentation rate. This study demonstrates that structural and dynamical characteristics of the magnetic field as measured in the photosphere are relevant to the intensity of non-stationary processes in the entire magnetic configuration.

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