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Evolution of solar active regions: Detecting the emergence of new magnetic field through multifractal segmentation
Golovko, A. A.; Salakhutdinova, I. I.
New emerging magnetic flux is identifed using a multifractal segmentation method used to investigate regularities in the evolution of active regions and activity complexes. The SOLIS, MDI SOHO, and SOT Hinode magnetograms were used. Observations of the active region NOAA 10488 on October 26-28, 2003 indicate considerable variability of areas of ne…
Active regions near the recent solar-cycle minimum: Relation between plasma heating and electrical currents
Livshits, M. A.; Rudenko, G. V.; Grigor'eva, I. Yu. +1 more
Data on small active regions on the Sun collected over three years (2007-2009) are analyzed. Under very quiescent conditions (a low X-ray background level), the shapes of the coronal loops of some active regions correspond fairly well to the shapes of magnetic-field lines calculated in a potential approximation. This is true of several active regi…
Fractal properties of active regions
Golovko, A. A.; Salakhutdinova, I. I.
The dynamics of active regions have been investigated using multi-fractal analysis methods, based on magnetograms of the full solar disk in the 630.2 nm line obtained with the SOLIS vector spectromagnetograph of Kitt Peak Observatory (USA) during 2006-2007 and January 1, 2009-April 12, 2010. The applied method of multi-fractal segmentation reveals…