Radioastronomical Studies of Plasmas from the Solar Corona to the Orbit of the Earth

从日冕到地球轨道的等离子体射电天文学研究

• 批准号: 9986887
• 负责人: Steven Spangler
• 金额: $ 28.5万
• 依托单位: University of Iowa
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2000
• 资助国家: 美国
• 起止时间: 2000-08-01 至 2004-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9986887&HistoricalAwards=false
• 关键词: Radioastronomical; Studies; Plasmas; Solar; Corona

Abstract: ATM 99-86887Proposal Title: Radioastronomical Studies of Plasmas from the Solar Corona to the Orbit of EarthPrincipal Investigator: Steven R. Spangler, University of Iowa The investigators will employ radioastronomical observations to learn more about the solar corona and the solar wind within 0.28 astronomical units of the Sun, a region of space where direct measurements have never been made. The main effort is to use radio telescopes such as the Very Large Array and the Green Bank Telescope to observe distant, astronomical radio sources when they are occulted by the corona and the inner solar wind. Plasma characteristics of the corona and solar wind are inferred from distortions and modifications of the radio waves, a phenomenon generically known as interplanetary scintillation. Faraday rotation data will be used to construct and refine a model of the plasma density and magnetic field in the outer corona and inner solar wind. Observations will be supported by a program of theoretical research to develop models for plasma turbulence in this region of space. Effort will be concentrated on simplified theories of plasma turbulence, which nonetheless possess sufficient realism to explain the main observed features of the solar wind turbulence.

摘要：ATM 99- 86887提案题目：日冕到地球轨道等离子体的射电天文学研究。斯潘格勒，爱荷华州大学研究人员将利用射电天文学观测来了解太阳0.28天文单位内的日冕和太阳风，这是一个从未进行过直接测量的空间区域。主要的努力是使用射电望远镜，如甚大天线阵和绿色银行望远镜，以观察遥远的天文射电源时，他们被日冕和内太阳风掩盖。日冕和太阳风的等离子体特征是从无线电波的扭曲和修改中推断出来的，这种现象通常被称为行星际闪烁。法拉第旋转数据将用于构建和改进外日冕和内太阳风中等离子体密度和磁场的模型。观测将得到一个理论研究方案的支持，以建立这一空间区域等离子体湍流的模型。努力将集中在简化理论的等离子体湍流，但拥有足够的现实解释的主要观测特征的太阳风湍流。