Накопление и выделение энергии в активной области по данным многоволновых наблюдений с высоким пространственным разрешением

И. А. Бакунина; Мельников В. Ф.; Моргачев А. С.; Кузнецов С. А.; Шаин А. В.

doi:10.31725/0552-5829-2018-275-278

Publications

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Накопление и выделение энергии в активной области по данным многоволновых наблюдений с высоким пространственным разрешением

С. 275–278.

Bakunina I. A., Мельников В. Ф., Моргачев А. С., Кузнецов С. А., Шаин А. В.

In this paper, we describe the spatial structure and time characteristics of the microwave
emission of active region AR 12673 during the rapid changes in the magnetic flux on
September 4, 2017 using Nobeyama Radioheliograph observations. It is shown that the microwave
emission of the active region exhibits extremely dynamic behavior of its spatial
brightness distribution as well as a very non-stationary, impulsive, emission from the specific
position where М1.2 class flare happens later. It is shown from comparison of microwave and
EUV maps that the strong non-stationary microwave flare happens at the position where a
system of intersecting compact EUV loops appears.

Keywords: микроволновое излучение солнечные вспышки solar flares microwave emission

In book

Труды XXII Всероссийской ежегодной конференции по физике Солнца “Солнечная и солнечно-земная физика - 2018”, 8-12 октября 2018, ГАО РАН, Санкт-Петербург, 2018

СПб.: Главная (Пулковская) астрономическая обсерватория РАН, 2018.

Spatial Position of Magnetic Flux Ropes in Flare Active Regions with and without Coronal Mass Ejections

I. A. Bakunina, Melnikov V. F., Shain A. V. et al., Geomagnetism and Aeronomy 2024 Vol. 64 No. 8 P. 1237–1249

Using statistics from 15 X-ray class M flare events, the features of the position and orientation of magnetic flux ropes in the general spatial structure of the magnetic field of the active region (AR) during flares and coronal mass ejections (CME) were studied by reconstructing the coronal magnetic field from the photosphere to the corona ...

Added: February 17, 2025

Preflare Fluctuations of Radio Emission from Active Regions of the Sun According to Observations at RSTN

Abramov-Maximov V. E., Bakunina I. A., Geomagnetism and Aeronomy 2024 Vol. 64 No. 7 P. 1054–1058

For the first time, several flare events are analyzed based on multifrequency observations using the Radio Solar Telescope Network. The purpose of the analysis is to identify signs of flare preparation. In all considered cases, preflare quasi-periodic fluctuations (QPFs) of radio emission were detected. The duration of preflare wavetrains is 6–20 min. Wavetrains consist of 3–5 pulses. QPFs ...

Added: February 17, 2025

Поведение микроволнового излучения в активных областях с «запертыми» и «открытыми» магнитными жгутами

Bakunina I. A., Мельников В. Ф., Шаин А. В. et al., В кн.: XXVIII всероссийская ежегодная конференция «Солнечная и солнечно-земная физика-2024», Труды.: СПб.: Главная (Пулковская) астрономическая обсерватория РАН, 2024. С. 25–28.

It is shown on a sample of 15 M-class X-ray flares that CMEs occur in events with «open» magnetic ropes reconstructed in the NLFFF approximation. Magnetic ropes coincide with radio brightness maxima at 17 GHz. Several hours before the flare, in the region of magnetic ropes, a glow of loops in the EUV (94, 131 ...

Added: December 1, 2024

XXVIII всероссийская ежегодная конференция «Солнечная и солнечно-земная физика-2024», Труды

СПб.: Главная (Пулковская) астрономическая обсерватория РАН, 2024.

Сборник содержит доклады, представленные на XXVIII Всероссийскую ежегодную конференцию по физике Солнца «Солнечная и солнечно-земная физика – 2024» (7 – 11 октября 2024, ГАО РАН, Санкт-Петербург). Конференция проводилась Главной (Пулковской) астрономической обсерваторией РАН при поддержке секции «Солнце» Научного совета по астрономии РАН и секции «Физика солнечной плазмы» Научного совета «Солнце-Земля». Тематика конференции включала в себя ...

Added: December 1, 2024

Magnetic Flux Ropes in Active Regions with M-Class Flares

I. A. Bakunina, Melnikov V. F., Kuznetsov S. A. et al., Geomagnetism and Aeronomy, Netherlands 2023 Vol. 63 No. 8 P. 1154–1166

The dynamics of the magnetic field reconstructed in the nonlinear force-free approximation in the pre-flare and post-flare phases of M-class X-ray flares in seven active regions is considered: two flares with a coronal mass ejection (CME), two flares with eruption but no CMEs, and three flares without eruption. Extrapolation of the magnetic field to the ...

Added: February 3, 2024

The Frequency of Occurrence of Pre-Flare Fluctuations in Microwave Radiation of Active Regions

Abramov-Maximov V. E., I. A. Bakunina, Geomagnetism and Aeronomy, Springer, Switzerland 2023 Vol. 63 No. 7 P. 916–919

We present a study of the frequency of occurrence of quasi-periodic fluctuations (QPFs) of microwave radiation from solar active regions at the pre-flare stage. We used correlation curves obtained with the Nobeyama Radioheliograph (NoRH). We analyzed 529 flares of classes X, M, and C (according to the GOES classification). In a significant number of considered events (approximately 75% ...

Added: December 28, 2023

Conditions for the Excitation of Type I Solar Bursts

P.A.Bespalov, O.N.Savina, Geomagnetism and Aeronomy 2023 Vol. 63 No. 7 P. 910–915

According to modern concepts, Type I noise storms in the meter wavelength range (30–400 MHz), consisting of a large number of narrow-band short bursts, are excited in the rarefied solar corona. These radiations are characterized by a high brightness temperature and circular polarization. Despite many advances in theory and confidence that the mechanism of radiation ...

Added: December 22, 2023