Flows and magnetic fields of sunspots at high spatial resolution

高空间分辨率下太阳黑子的流动和磁场

• 批准号: 26763380
• 负责人: Professor Dr. Franz Kneer
• 金额: --
• 依托单位: Institut für Astrophysik und Geophysik
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2006
• 资助国家: 德国
• 起止时间: 2005-12-31 至 2007-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/26763380?language=en
• 关键词: Flows; magnetic; fields; sunspots; spatial

Sunspots, detected in Europe in the early 17th century, have remained fascinating research objects on the Sun. Their magnetic fields, interacting with the ionized gas, give rise to high structuring and constitute a paradigm for the dynamic processes in astrophysical plasmas. Sunspots with their dark umbrae, with their filamentary penumbrae, and with their nearby magnetic activity, are still enigmatic. Our knowledge is limited mainly due to insufficient spatial resolution of the observations. Yet since few years, solar telescopes were equipped with Adaptive Optics (AO), and post-facto image restoration has become in regular use. New findings by our group, achieved with image reconstruction but without AO, gave hints on how to reconcile earlier, contradictory descriptions of the intensity, magnetic field, and velocity fluctuations in sunspots. Substantially improved observations of sunspots have been obtained in 2005 with the new two-dimensional ¿Göttingen¿ Fabry-Pérot spectrometer at the German solar telescope on Tenerife. The observations were supported by AO supplied by the Kiepenheuer-Institut/Freiburg. Refinements of data analysis and interpretation will lead to measurements of flow velocities and magnetic fields with the required high spatial resolution. We will thus contribute to the understanding of the mechanisms causing the dynamic behavior of sunspots.

太阳黑子于17世纪早期在欧洲被发现，至今仍是太阳上令人着迷的研究对象。它们的磁场与电离气体相互作用，产生高结构，并构成天体物理等离子体动态过程的范例。太阳黑子的暗影、丝状半影以及它们附近的磁场活动仍然是个谜。我们的知识有限，主要是由于观测的空间分辨率不足。然而，几年来，太阳望远镜配备了自适应光学（AO），并且事后图像恢复已经成为常规使用。我们小组的新发现是通过图像重建而非AO获得的，它为如何调和早先对太阳黑子的强度、磁场和速度波动的相互矛盾的描述提供了提示。2005年，在特内里费岛上的德国太阳望远镜上使用了新的二维¿Göttingen¿fabry - p<s:1>罗特光谱仪，大大改进了对太阳黑子的观测。这些观测得到了基彭豪尔研究所/弗莱堡提供的AO的支持。数据分析和解释的改进将使流速和磁场的测量具有所需的高空间分辨率。因此，我们将有助于了解引起太阳黑子动态行为的机制。