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Evolution of Characteristics of Vertical Electric Current and Magnetic Field in Active Regions of the Sun and Their Relation to Powerful Flares

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Abstract

The study of evolution of magnetic field and electric currents in active regions of the Sun over a long-time interval is of interest for understanding the processes of energy accumulation and release in them, leading to various phenomena that affect space weather. In this study, based on the photospheric vector magnetograms of the helioseismic and magnetic imager instrument aboard the Solar Dynamics Observatory, the authors analyzed the evolution of a number of characteristics of the magnetic field and vertical electric current in three active regions, 11 158, 11 675, and 12 673, that produced M and X class flares, during the time from their origin in the eastern hemisphere, during passage through the solar disk, and until their disappearance near the western limb with a step of 2 h. The characteristics considered included: the power-law exponent of the probability density function of the absolute value of the vertical electric current density, the maximum absolute value of the vertical current density, the signed and unsigned total vertical currents and the unsigned total vertical and horizontal magnetic fluxes, the energy of the nonlinear force-free and potential magnetic fields, the free magnetic energy, and the number of islands with strong vertical current. Some regularities in the behavior of the characteristics considered are found, in particular, regarding the occurrence of solar flares. The correlation coefficients between pairs of these characteristics are calculated. Additionally, M. Aschwanden’s approach is shown to be promising for predicting the maximum X-ray class of a flare by calculating the energy of the potential magnetic field in active regions. The results can be used to predict powerful solar flares.

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ACKNOWLEDGMENTS

The authors of the article thank the SDO/HMI team and NASA for providing open access to data. The authors also acknowledge MAAT: MATLAB Astronomy and Astrophysics Toolbox (Ofek, 2014), which was used to process the data for this article. The authors also thank the reviewers for their suggested corrections.

Funding

The study was supported from the State Subsidy for Scientific Research within the framework of the topic PLASMA.

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Authors and Affiliations

  1. Space Research Institute, Russian Academy of Sciences, Moscow, Russia

    A. B. Nechaeva, I. V. Zimovets & I. N. Sharykin

  2. Landau Phystech School of Physics and Research, Moscow Institute of Physics and Technology (National Research University), Dolgoprudny, Moscow Region, Russia

    I. V. Zimovets & V. S. Zubik

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  1. A. B. Nechaeva
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  2. I. V. Zimovets
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Nechaeva, A.B., Zimovets, I.V., Zubik, V.S. et al. Evolution of Characteristics of Vertical Electric Current and Magnetic Field in Active Regions of the Sun and Their Relation to Powerful Flares. Geomagn. Aeron. 64, 150–171 (2024). https://doi.org/10.1134/S0016793223601060

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