The Study of Coronal Plasma Turbulence with Radioastro- nomical Interferometers

本项目将研究日冕中的等离子体辐射 和太阳风之间的联系。 的来源 无线电波是河外射电源， 在宽的频率范围内的部分线性偏振辐射。 用标准射电天文观测源 甚大阵列（VLA）和甚长阵列（VLA）等仪器 基线阵列（VLBA）。 当这些来源被视为通过 日冕和太阳风的湍流等离子体介质，各种 可以观察到失真或“模糊”效应。 从 这些效应的测量，强度的信息， 空间功率谱和湍流的物理性质可以 被演绎。 在建议的资助期内， 日冕湍流将从两种类型的观测中获得。 第一个是测量角变宽或“模糊”， 通过湍流介质观察到的无线电源。 这些 将使用VLA和VLBA进行观测。 第二 一种观测类型包括测量法拉第旋转， 线性极化射电源的极化面。 这些观察结果将与VLA一起进行，并提供 日冕磁场变化的信息， 以及密度变化。 最后，进行理论工作 它将射电天文学观测数据与 日冕电浆波 #

This project will study plasma turbulance in the solar corona and solar wind using radio propagation techniques. The sources of the radio waves are extragalactic radio sources which emit partially linearly polarized radiation over a wide frequency range. The sources are observed with standard radioastronomical instruments such as the Very Large Array (VLA) and Very Long Baseline Array (VLBA). When these sources are viewed through the turbulent plasma medium of the corona and solar wind, various distortion or "blurring" effects may be observed. From measurements of these effects, information about the intensity, spatial power spectrum, and physical nature of the turbulence can be deduced. During the proposed grant period information on coronal turbulence will be obtained from two types of observation. The first is a measurement of angular broadening or "blurring" of a radio source viewed through a turbulent medium. These observations will be carried out with the VLA and VLBA. The second type of observation consists of measurement of Faraday Rotation of the plane of polarization of alinearly polarized radio source. These observations will be made with the VLA and will provide information on variations in the magnetic field in the corona as well as density variations. Finally, theoretical work will be made which relates radioastronomical observables to properties of coronal plasma waves. #