Mechanism for producing the U-shaped spectrum of the type-IV solar radio bursts

Chinese Astronomy Pub Date : 1980-06-01 DOI:10.1016/0146-6364(80)90046-8

Li Chun-sheng, Zheng Xing-wu, Jiang Shu-ying, Yao Jin-xing, Zhou Ai-hua

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引用次数: 5

Abstract

A mechanism is proposed to account for the U-shaped spectrum of the type IV solar radio burst during the explosive phase of proton flare. The U-shaped spectrum consists of two parts, namely the part of type IV_μ burst and that the type IV_dm burst. Each of them is believed to be produced by gyrosynchroton radiation of nonthermal electrons (100keV ≤ ϵ ≤ 2MeV) accelerated simultaneously with protons in explosive phase and gyroresonance absorption of thermal electrons.

Numerical calculations are presented for the flux densities of type IV_μ burst and type IV_dm during 7 August 1972 event, assuming the volume of these burst sources being cylinders. It is shown that the results of numerical calculations are consistent with that of observations.

The reversal of polarized waves sense from type IV_μ burst source into type IV_dm sources is explained by the fact that the direction of the magnetic field line in one source is anti-parallel to that in the other.

Besides, we also discuss the relation between the U-shaped spectrum of type IV radio burst and the occurrence of proton event.

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产生第四型太阳射电暴u型频谱的机制

提出了一种解释质子耀斑爆炸阶段IV型太阳射电暴u型谱的机制。u型谱由IVμ型暴和IVdm型暴两部分组成。它们都被认为是由非热电子(100keV≤λ≤2MeV)与处于爆炸相的质子同时加速的回旋同步辐射和热电子的回旋共振吸收产生的。本文给出了1972年8月7日事件中IVμ型暴和IVdm型暴的通量密度的数值计算，假设这些暴源的体积为圆柱体。结果表明，数值计算结果与观测结果吻合较好。极化波感测从IVμ爆发型源向IVdm型源的反转可以用一个源的磁场线方向与另一个源的磁场线方向反平行来解释。此外，我们还讨论了IV型射电暴u型谱与质子事件发生的关系。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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Chinese Astronomy

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