Evolution of the compact microwave inter-sunspot source before strong flare

International Conference on Particle Physics and Astrophysics

物理学;天文学

Bakunina, I.A.^1 ; Abramov-Maximov, V.E.^2 ; Osharin, A.M.^1

National Research University, Higher School of Economics, 25/12 B. Pecherskaja ul., Nizhny Novgorod

603155, Russia^1

Central Astronomical Observatory at Pulkovo, Russian Academy of Sciences, Pulkovskoe chaussee 65/1, St Petersburg

196140, Russia^2

关键词: Active regions;    Magnetic field gradient;    Microwave sources;    Neutral line;    Solar activity;    Spatial resolution;    X-class flares;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/798/1/012041/pdf
DOI  :  10.1088/1742-6596/798/1/012041

学科分类：天文学(综合)

来源: IOP

【 摘 要 】

Under this study we considered active region 09415 of the 23-rd cycle of solar activity which was observed with the 2D spatial resolution at three frequencies: 17 and 34 GHz with the Nobeyama Radioheliograph (NoRH) and 17 GHz with the Solar Siberian Radiotelescope (SSRT). We detected rapid development of a compact microwave source above the neutral line of the magnetic field of leading sunspot (NLS-source) few hours before the X-class flare. The position of this source is associated with the place of the maximum of magnetic field gradient at the photosphere.