aat Acta Astrophys. Tau. Acta Astrophysica Taurica 2712-925X Kiselev Nikolai Nikolaevich, Mosсow, settlement Moskovskii, Tat'yanin Park Str., 12, Moscow, Russia. RU 86 Magnetism and activity of the Sun and stars – 2021 Conference proceedings Spatial and temporal features of the behavior of microwave and ultraviolet emission in eruptive events Bakunina Irina Melnikov Victor Shain Aleksandr Abramov-Maхimov Vladimir Morgachev Aleksandr HSE University, Bolshaya Pecherskaya ulitsa 25/12, Nizhny Novgorod 603155, Russia Central Astronomical Observatory at Pulkovo of RAS, Pulkovskoe shosse 65/1, St. Petersburg 196140, Russia Central Astronomical Observatory at Pulkovo of RAS, Pulkovskoe shosse 65/1, St. Petersburg 196140, Russia Central Astronomical Observatory at Pulkovo of RAS, Pulkovskoe shosse 65/1, St. Petersburg 196140, Russia Lobachevsky State University of Nizhny Novgorod, Gagarin av. 23, Nizhny Novgorod 603022, Russia 30 09 2024 5 3 6 13 23 09 2024 Copyright (c) 2024 Irina Bakunina, Victor Melnikov, Aleksandr Shain, Vladimir Abramov-Maхimov, Aleksandr Morgachev 2024 Irina Bakunina, Victor Melnikov, Aleksandr Shain, Vladimir Abramov-Maхimov, Aleksandr Morgachev The metadata for this submission is licensed under a Creative Commons Attribution 4.0 International License. Copyright and publishing rights for texts published in Acta Astrophysica Taurica is retained by the authors, with first publication rights granted to the journal.Texts are free to use with proper attribution and link to the licensing (Creative Commons Attribution 4.0 International).

Observational signatures that determine the ability of a solar active region to cause a mass ejection into the high layers of the solar corona (CME) are not entirely clear to date. This makes it difficult to understand the physical mechanism of the CME trigger. This paper presents a search for observational signatures that may indicate the emergence of an eruptive process. For this aim, we have carried out a comparative analysis of the conditions before and during a flare for flare events both accompanied and not accompanied by CMEs. We studied the features of the spatial and temporal dynamics of microwave and ultraviolet emission (data from the Nobeyama Radio Heliograph, SDO/AIA), as well as magnetic fields (SDO/HMI) for 16 active regions (ARs). Using this sample, it was found that the flares accompanied by CMEs most often occur in open magnetic configurations, in regions with twisted magnetic ropes and emerging magnetic fluxes. CMEs are also observed most often in flares of longer duration and in those ARs that have sources in microwave radiation that are more extended in area.

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