The Structure and Cause of Sunspot Penumbrae Investigated Using High-Resolution Spectropolarimetry

使用高分辨率分光偏振法研究太阳黑子半影的结构和成因

• 批准号: 9710782
• 负责人: KD Leka
• 金额: $ 25.22万
• 依托单位: NorthWest Research Associates, Incorporated
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1998
• 资助国家: 美国
• 起止时间: 1998-06-01 至 2002-05-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9710782&HistoricalAwards=false
• 关键词: Structure; Cause; Sunspot; Penumbrae; Investigated

This research investigates the structure and cause of sunspot penumbra. The investigators use an inversion of data that couple high spatial resolution, high spectral resolution, and the full polarization state of light from the solar photosphere. This inversion allows them to determine the vector magnetic field and the thermodynamic state in the line-forming region. Specifically, investigators compare and contrast two inversion techniques: one that allows multiple magnetic atmospheres and non-magnetic model atmosphere to contribute to the detected signal; the second, a procedure that allows for bulk gradients in the velocity field and magnetic vector within the model atmosphere. The more successful inversion procedure dictates which model applies to interpreting penumbral observations. Finally, the investigators answer how, why and when penumbrae form in sunspot evolution. Results from the research paint a more coherent physical picture of sunspot penumbrae, where knowledge has previously been limited, to attempt understanding magnetohydrodynamic phenomena in the sun (especially associated with sunspots).

本研究探讨太阳黑子半影的结构与成因。 研究人员使用了一种结合了高空间分辨率、高光谱分辨率和太阳光球光的全偏振态的数据反演。 这种反演使他们能够确定矢量磁场和线形成区域的热力学状态。 具体来说，研究人员比较和对比两种反演技术：一种是允许多个磁性大气和非磁性模型大气有助于检测到的信号;第二种是允许模型大气中的速度场和磁矢量中的体积梯度的程序。 更成功的反演程序决定了哪种模型适用于解释半影观测。 最后，研究人员回答了太阳黑子演化过程中半影是如何、为什么以及何时形成的。 这项研究的结果描绘了一幅更加连贯的太阳黑子半影的物理图像，在那里，知识以前是有限的，试图理解太阳中的磁流体动力学现象（特别是与太阳黑子有关的）。