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太阳米波和分米波段射电暴及其精细结构的观测研究
Alternative TitleThe Solar Radio Bursts and Fine Structures in Metric and Decimetric Bands
高冠男
Subtype博士
Thesis Advisor林隽 ; 汪敏
2015-07-01
Degree Grantor中国科学院研究生院
Place of Conferral北京
Degree Discipline天体物理
Keyword太阳耀斑 日冕物质抛射 射电频谱仪 射电暴 射电精细结构
Abstract首先对云南天文台新研制的高时间(2 ms)和高频谱(200 kHz)分辨率的米波(70–700MHz)和分米波段(625–1500 MHz)太阳射电频谱仪进行了详细的介绍, 并展示它们最初的观测结果。目前这两台射电频谱仪已经观测到大量的射电暴和射电精细结构,其中很多非常精细的射电精细结构被观测到。 其次,我们对国家天文台太阳射电频谱仪2004年12月1日观测到的射电暴进行了研究,并基于太阳爆发的物理模型和数值模拟的结果,结合EUV, 软/硬X射线等观测资料对该射电暴提出了新的解释,认为是电流片中磁重联形成的等离子团沿着电流片运动,耀斑环系统的上升,以及磁重联外流在耀斑环顶产生终止激波等一系列的过程,导致了该射电暴在射电动态频谱上呈现正向、反向和零漂移频率多条辐射带的类斑马纹结构。 另外,我们还对云南天文台米波太阳射电频谱仪在2012年11月13日观测到的、奇特的II型射电暴的断裂结构进行研究。多波段的观测数据表明在活动区AR11613产生了两个耀斑以及相关联的两个CME和两个II型射电暴。我们发现第一个CME快速运动后面形成电流片,第二个CME(或耀斑)驱动激波与该电流片相互作用产生了II型射电暴的断裂结构;根据激波的速度和断裂结构持续的时间我们还估算了电流片的厚度,并根据两个射电II型暴的分裂带以及射电II型暴的起始频率对日冕磁场强度进行估计,发现用两种方法获得的磁场强度非常一致。
Other AbstractWe introduced the decimetric and metric solar radio spectrometers of Yunnan Astronomical Observatories (YNAO) working in the frequency range of 625– 1500 MHz and 70–700 MHz, respectively. Many solar radio bursts have been observed. In these events, various types of decimetric and metric fine structures with fairly meticulous spectral features were recognized. In addition, we investigate the spectral fine structure of a solar radio burst observed by the Solar Broadband Radio Spectrometer (SBRS) at the Huairou Solar Observing Station (HSOS) in a CME/flare event on December 1, 2004. The data during the impulsive phase of the event display two phases of a zebralike emission patterns, including positively and negatively drifting as well as non-drifting stripes.In addition to the radio data, we also studied the associated data in white-light, EUV, soft and hard X-rays. By comparing with the observational consequences of the standard model of two-ribbon flares, we put forward a possible explanation for these zebra-like patterns, which have even been observed in similar events before, such that they display various patterns of plasma motions. These are sunward motions of plasmoids in the CME/flare reconnecting current sheet and possibly also the termination shock on the loop top and the growth of the flare loop system. We investigated a peculiar metric type II solar radio burst with a broken lane structure, which was observed on November 13, 2012. In addition to the radio data, we also studied the data in the other wavelengths. The events took place from the active region AR 11613 that produced two flares ,the associated CMEs and type II busrts. A long current sheet was developed by the first CME, and the second CME collided with the current sheet first and then merged with the first one. Combing information revealed by the multi-wavelength data indicated that a coronal shock accounting for the type II radio burst, and that the collision of this shock with the current sheet resulted in the broken lane of the type II radio burst. The type II burst lane resumed after the shock passed through the current sheet. We further estimated the thickness of the current sheet according to the gap on the lane of the type II burst, and magnetic field in the two sources region.
Subject Area天文学
Language中文
Document Type学位论文
Identifierhttp://ir.ynao.ac.cn/handle/114a53/9469
Collection射电天文研究组
Affiliation中国科学院云南天文台
Recommended Citation
GB/T 7714
高冠男. 太阳米波和分米波段射电暴及其精细结构的观测研究[D]. 北京. 中国科学院研究生院,2015.
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