Spatial and Spectral Evolution of Microwave and X-Ray Sources During the Solar Limb Flare on February 5, 2023

IF 2.7 3区物理与天体物理 Q2 ASTRONOMY & ASTROPHYSICS

Solar Physics Pub Date : 2024-06-10 DOI:10.1007/s11207-024-02331-w

Julia N. Shamsutdinova, Larisa K. Kashapova, Zhentong Li, Yang Su

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Abstract

We present an empirical scenario of the energy release process during a solar limb flare on February 5, 2023. This event was observed by the Siberian Radioheliograph (SRH) within the 3 – 12 GHz range and the Advanced Space-based Solar Observatory / Hard X-ray Imager (ASO-S/HXI) within 10 – 300 keV range. The combination of these data allowed us to use information not only about the spectral features but also about the spatial evolution of the flare. The main source of the energy released was a small compact loop which was revealed in both the X-ray and microwave ranges. During the early phases of the flare evolution, a spectral analysis of microwave emission showed that thermal gyrosynchrotron emission turned to gyrosynchrotron emission of nonthermal electrons. This indicated the transition from the heating process to the acceleration processes. Spectral indices derived from hard X-ray and microwave data closely agree with each other and show the classical soft–hard–soft scenario of acceleration. The hardening of the average microwave spectrum at the end of the impulsive phase was caused by the contribution of jet emission to microwaves rather than by peculiarities of the acceleration processes.

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2023 年 2 月 5 日太阳边缘耀斑期间微波和 X 射线源的空间和光谱演变

我们提出了 2023 年 2 月 5 日太阳边缘耀斑期间能量释放过程的经验情景。这次事件是由西伯利亚射电日像仪（SRH）在3-12千兆赫范围内和先进天基太阳观测站/硬X射线成像仪（ASO-S/HXI）在10-300千伏范围内观测到的。结合这些数据，我们不仅可以利用有关光谱特征的信息，还可以利用有关耀斑空间演变的信息。释放能量的主要来源是一个小型的紧凑环，它在 X 射线和微波范围内都被揭示出来。在耀斑演化的早期阶段，对微波发射的光谱分析显示，热陀螺回旋发射转为非热电子的陀螺回旋发射。这表明已从加热过程过渡到加速过程。由硬 X 射线和微波数据得出的光谱指数非常吻合，显示了经典的软-硬-软加速情景。在脉冲阶段结束时，平均微波频谱变硬，这是由于喷流发射对微波的贡献，而不是加速过程的特殊性造成的。

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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来源期刊

Solar Physics 地学天文-天文与天体物理

CiteScore

5.10

自引率

17.90%

发文量

146

审稿时长

1 months

期刊介绍： Solar Physics was founded in 1967 and is the principal journal for the publication of the results of fundamental research on the Sun. The journal treats all aspects of solar physics, ranging from the internal structure of the Sun and its evolution to the outer corona and solar wind in interplanetary space. Papers on solar-terrestrial physics and on stellar research are also published when their results have a direct bearing on our understanding of the Sun.