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

项目名称：从太阳日冕到地球轨道等离子体的射电天文研究项目负责人：Steven R. Spangler，美国爱荷华大学研究人员将利用射电天文观测来了解距离太阳0.28天文单位范围内的日冕和太阳风，这是一个从未进行过直接测量的空间区域。主要的工作是使用射电望远镜，如甚大阵列和格林班克望远镜，当它们被日冕和内部太阳风遮蔽时，观察遥远的天文射电源。日冕和太阳风的等离子体特征是从无线电波的扭曲和变化中推断出来的，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完善等离子体密度和外日冕和内太阳风磁场的模型。观测将得到一个理论研究项目的支持，该项目将开发该空间区域等离子体湍流模型。努力将集中在等离子体湍流的简化理论上，尽管如此，它仍然具有足够的现实性来解释观测到的太阳风湍流的主要特征。

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.