The spotless flare of 16 March 1981 – I. Pre-Flare Activations of the Chromospheric Fine Structure

A.V. Borovik; D. Yu. Myachin

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The spotless flare of 16 March 1981 – I. Pre-Flare Activations of the Chromospheric Fine Structure

机译：1981年3月16日一尘不染的耀斑– I.大气层精细结构的耀斑前活化

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This paper is based on observations in the Hα line with the aim to carry out a detailed study of the spotless flare of importance 1N that was observed at the Baikal Astrophysical Observatory on 16 March 1981. The study focuses on the evolution of the region of interest from the time of its appearance from behind the limb, and on the pre-flare activation of chromospheric features four hours before the flare. The disturbances that preceded the flare spanned an area of about 120 square degrees. The bulk of activations occurred along and near the path of the polarity inversion line (PIL) of the longitudinal component of the magnetic field. The flare was preceded by an eruptive filament, a disturbance of the fine structure of supergranulation cells, and by the formation of dark vortex structures in regions where flare ribbons form; dark mottles in these regions signaled the operation of an oscillatory process with a period of about 3–4 min, and the region where one of the flare ribbons formed showed a `tunnel' of a system of small-scale dark loops. A close association of the chromospheric activations and flare mottles, with the boundaries of the chromospheric and magnetic networks, is established.

机译：本文基于对Hα线的观测，目的是对1981年3月16日在贝加尔天体物理观测所观测到的重要1N无斑点耀斑进行详细研究。研究的重点是感兴趣区域的演变从出现在肢体后面开始，到耀斑爆发前四个小时，先激活了色球层特征。耀斑之前的干扰范围约为120平方度。大量的激活沿着磁场的纵向分量的极性反转线（PIL）的路径并在其附近发生。在爆发之前，爆发出细丝，扰乱了超颗粒细胞的精细结构，并在形成爆发带的区域形成了暗涡结构。这些区域中的深色斑点表明振荡过程的运行时间约为3-4分钟，而形成的火炬带之一的区域则显示出一个小型暗环系统的“隧道”。建立了色球层激活和耀斑斑与色球层和磁网络边界的紧密联系。

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《Solar Physics》 |2002年第1期|105-116|共12页
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A.V. Borovik; D. Yu. Myachin;
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Institute of Solar-Terrestrial Physics SD RAS;

Institute of Solar-Terrestrial Physics SD RAS;

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The spotless flare of 16 March 1981 – I. Pre-Flare Activations of the Chromospheric Fine Structure

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