Evolution of Solar Active Regions Before Large Flares: Overview of the Events of 2010–2017
作者： A. G. Tlatov , V. E. Abramov-Maximov , V. N. Borovik , L. V. Opeikina
DOI: 10.1134/S0016793218080170
关键词: Astrophysics 、 Solar dynamics observatory 、 Magnetic polarity 、 Magnetic field 、 Polarity (physics) 、 Physics 、 Geostationary Operational Environmental Satellite 、 Flare index
摘要: The paper presents a study of the evolution photospheric magnetic field active regions (ARs) Sun in which flares (larger than M9 class Geostationary Operational Environmental Satellite (GOES) X-ray classification) occurred 2010–2017. purpose this is to detect precursors flares. Thirteen ARs at distance not more 45 degrees from central meridian are selected for analysis out 31 larger M9.0 were detected specified period. magnetographic characteristics studied based on Solar Dynamics Observatory (SDO) data. A flare index proposed. It calculated data Helioseismic and Magnetic Imager SDO (SDO/HMI) reflects between opposite polarity computed boundaries by threshold value. showed that sharp increase all 2–3 days before large Flares 5–20 h after global or local maximum index. shown using example individual events first converged then relatively quickly separated each other revealed features can be used develop methods predicting them.
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