2022年7月4日的复杂II型太阳射电事件

IF 0.5 Q4 PHYSICS, APPLIED Latvian Journal of Physics and Technical Sciences Pub Date : 2022-12-01 DOI:10.2478/lpts-2022-0044
J. Kallunki
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引用次数: 0

摘要

2022年7月4日,阿尔托大学Metsähovi射电天文台观测到一次复杂的低频太阳射电暴。在20至80兆赫之间的频率范围内观察到无线电脉冲。在地球同步运行环境卫星(GOES)级别中,该事件被归类为C5.1级。然而,日冕物质抛射(CME)与这一事件无关。观测到的射电暴是一个持续时间约10分钟的事件,主要可归类为II型太阳射电事件。在持续时间较长的II型太阳事件之前,也观测到了III型太阳事件。该事件包括共频漂移发射结构,既有基频结构,也有谐波结构,但也很少观测到类连续结构或静止结构。假设连续状射电发射结构起源于静止的耀斑(日冕)环,它在整个事件中都是可见的。漂移发射结构是指由激波相关现象产生的加速电子。本文提供了该事件的射电波长观测结果,以及软x射线谱和光学波长(AIA 171)。此外,还提出了在II型太阳暴中形成漂移和连续的太阳射电发射的一种可能的简化情形。
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Complex Type II Solar Radio Event on 4 July 2022
Abstract On 4 July 2022, a complex low-frequency solar radio burst was observed in Metsähovi Radio Observatory of Aalto University. The radio burst was observed at a frequency range between 20 and 80 MHz. In GOES (Geostationary Operational Environmental Satellite) class, the event was classified as C5.1. However, coronal mass ejection (CME) was not associated to this event. The observed radio burst was a long-lasting (~10 minutes) event, and it could be mainly classified as type II solar radio event. Also type III solar events were observed before long-lasting type II event. The event includes common frequency drifting emission structures, both fundamental and harmonic structures, but also rarely observed continuum-like or stationary structure. It is assumed that the continuum-like radio emission structure is originated from the stationary flare (coronal) loop, which was visible over the whole event. The drifting emission structure means accelerated electrons, which are produced by the shock related phenomena. The paper provides the observations from this event on radio wavelength, and also soft-X-ray regime and optical wavelength (AIA 171). In addition, a possible, simplified scenario is presented for forming the drifting and continuum solar radio emissions in type II solar burst.
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来源期刊
CiteScore
1.50
自引率
16.70%
发文量
41
审稿时长
5 weeks
期刊介绍: Latvian Journal of Physics and Technical Sciences (Latvijas Fizikas un Tehnisko Zinātņu Žurnāls) publishes experimental and theoretical papers containing results not published previously and review articles. Its scope includes Energy and Power, Energy Engineering, Energy Policy and Economics, Physical Sciences, Physics and Applied Physics in Engineering, Astronomy and Spectroscopy.
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