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Die Erzeugung und Dissipation von solaren Magnetfeldern

太阳磁场的产生和耗散

基本信息

批准号：
182502164
负责人：
Professor Dr. Wolfgang Schmidt
金额：
--
依托单位：
Institut für Sonnenphysik (KIS)
依托单位国家：
德国
项目类别：
Research Grants
财政年份：
2011
资助国家：
德国
起止时间：
2010-12-31 至 2012-12-31
项目状态：
已结题

来源：
https://gepris.dfg.de/gepris/projekt/182502164?language=en
关键词：
Die Erzeugung und Dissipation von

项目摘要

The generation, evolution, and dissipation of cosmic magnetic fields is one of the fundamental problems in astrophysics. The Sun as the closest star offers the unique opportunity to gain understanding of how magnetic fields interact with dynamic plasma: it is the action of moving ionized gas that is crucial for generating magnetic field. The solar photosphere manifests the upper boundary of a convection zone of ionized plasma, from which magnetic fields emerge, escaping into interplanetary space. In the photosphere the magnetic fields exist on a large range of spatial scales: from magnetic elements with sizes of a few hundred km or less to sunspots which a typical diameter of 30 000 km.This project will take advantage of unique sources of data that allow to improve our understanding of solar magnetic fields: (1) We will analyze data from the 1m SUNRISE Solar telescope that flew on a stratospheric balloon in June 2009. This mission has acquired the best-ever spectropolarimetric data of the quiet Sun. These data will allow to analyze how magnetic field emerges, evolves and eventually dissipates. (2) At the German Vacuum Tower Telescope, in July 2009, we have witnessed the formation of a sunspot under excellent seeing conditions. We have observed the formation process with two spectro-polarimeters and imaging devices. This data set of extraordinary quality and completeness will allow to address the long standing problem of how magnetic field emerges to form sunspots.

宇宙磁场的产生、演化和耗散是天体物理学的基本问题之一。太阳作为最近的恒星提供了独特的机会来了解磁场如何与动态等离子体相互作用：移动电离气体的作用对于产生磁场至关重要。太阳光球层呈现出电离等离子体对流区的上边界，磁场从中出现，逃逸到行星际空间。在光球层中，磁场存在于大范围的空间尺度上：从尺寸为几百公里或更小的磁性元素到典型直径为 30 000 公里的太阳黑子。该项目将利用独特的数据源来提高我们对太阳磁场的理解：(1) 我们将分析来自 2009 年 6 月乘坐平流层气球飞行的 1m SUNRISE 太阳望远镜的数据。获得了有史以来最好的安静太阳的光谱偏振数据。这些数据将有助于分析磁场如何出现、演变和最终消散。（2）2009年7月，在德国真空塔望远镜，我们在良好的视宁条件下目睹了太阳黑子的形成。我们用两台分光旋光仪和成像设备观察了形成过程。该数据集具有非凡的质量和完整性，将有助于解决磁场如何形成太阳黑子这一长期存在的问题。