Mariano Poisson, Marcelo López Fuentes, Cristina H. Mandrini, Pascal Démoulin, Francisco Grings
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引用次数: 0
摘要
太阳大气中出现活动区(ARs)是磁通量绳(FRs)出现的结果。在这项研究中,我们使用贝叶斯方法来分析正在出现的活动区的视线磁图。我们采用的磁流绳模型由基于八个参数的半三弦场结构组成。我们的目标是推导出与观测结果相一致的起源 FR 的受约束物理参数。具体来说,我们的目标是在出现过程的不同阶段获得对 AR 倾斜角和磁扭曲的精确估计。为此,我们提出了四种时间方法,将场参数演变与单个相干 FR 相关联。这些方法在探索的参数空间大小上互不相同。我们用太阳和日光层天文台上的迈克尔逊多普勒成像仪观测到的四个双极 AR 对这些方法进行了测试。我们发现,时间方法之间的倾斜角通常是一致的,在出现的各个阶段都改进了之前的估计。根据时间方法得出的扭转符号与之前的估计一致。所有方法的标准误差都很接近,表明它们对观测结果的建模效果相当好。这些结果表明,所提出的方法可用于获取 ARs 早期演化过程中的全局磁参数。得出的参数有助于更好地理解FRs的形成,以及ARs在太阳周期磁循环过程中的作用。
Modeling Global Magnetic-Flux Emergence in Bipolar Solar-Active Regions
Active regions (ARs) appear in the solar atmosphere as a consequence of the emergence of magnetic-flux ropes (FR). In this study, we use Bayesian methods to analyze line-of-sight magnetograms of emerging ARs. We employ a FR model consisting of a half-torus field structure based on eight parameters. The goal is to derive constrained physical parameters of the originating FR that are consistent with the observations. Specifically, we aim to obtain a precise estimation of the AR tilt angle and magnetic twist at different stages of the emergence process. To achieve this, we propose four temporal methods that correlate the field-parameter evolutions with a single coherent FR. These methods differ from each other in the size of the explored parameter space. We test the methods on four bipolar ARs observed with the Michelson Doppler Imager on board the Solar and Heliospheric Observatory. We find that tilt angles are typically consistent between the temporal methods, improving previous estimations at all stages of the emergence. The twist sign derived from the temporal methods is consistent with previous estimations. The standard errors of all the methods used are similar, indicating that they model the observations equally well. These results indicate that the proposed methods can be used to obtain global magnetic parameters of ARs during their early evolution. The derived parameters contribute to a better understanding of the formation of FRs, and the role of ARs in the magnetic recycling process along the solar cycle.
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.