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Preflare Dynamics of Microwave and Ultraviolet Emission in Active Regions of the Sun
Astrophysics ( IF 0.5 ) Pub Date : 2020-06-01 , DOI: 10.1007/s10511-020-09630-7
I. A. Bakunina , V. F. Melnikov , A. S. Morgachev

This paper is a study of the spatial dynamics of microwave emission (data from the Nobeyama Radioheliograph) from two active regions NOAA 12673 and NOAA 11261 for several hours prior to powerful class M x-ray flares. The spatial distribution of the radio brightness and emission intensity in certain parts of the active region is found to be highly nonstationary. Data in the ultraviolet (AIA/SDO) are also used for studying the fine structure of the active emission sources. It is shown that the spatial dynamics of the microwave sources correlates well with the position and appearance of bright ultraviolet (UV) loops in the 94 Å line, i.e., with magnetic loops where the plasma is heated to high temperatures ~10 7 K. A combined analysis of the UV and radio emission charts with magnetic field charts (HMI/SDO) for NOAA 12673 shows that the highly nonstationary behavior of the microwave sources develops simultaneously with the ignition of a system of intersecting UV loops (X-structures). It is also shown that the bright UV loops and microwave sources arise in the area where new magnetic fluxes emerge.

中文翻译:

太阳活动区微波和紫外线发射的预闪动力学

这篇论文是对来自两个活跃区 NOAA 12673 和 NOAA 11261 的微波发射空间动力学(来自 Nobeyama 射电日光仪的数据)在强大的 M 级 X 射线耀斑之前数小时的研究。发现活动区某些部分的射电亮度和发射强度的空间分布是高度非平稳的。紫外线(AIA/SDO)中的数据也用于研究活性发射源的精细结构。结果表明,微波源的空间动力学与 94 Å 线中明亮的紫外线 (UV) 环的位置和外观密切相关,即等离子体被加热到高温~10 7 K 的磁环。对 NOAA 12673 的紫外线和无线电发射图与磁场图 (HMI/SDO) 的组合分析表明,微波源的高度非平稳行为与交叉紫外线回路(X 结构)系统的点火同时发展。还显示明亮的紫外线回路和微波源出现在新磁通量出现的区域。
更新日期:2020-06-01
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