Solar Eclipse F Corona Velocity Measurements

罕见的短暂日全食提供了宝贵的 地面观察员研究内部区域的机会 太阳日冕。 大气层外区域的尘埃颗粒 日冕（F日冕）被认为是轨道下的组合 太阳引力和辐射力的影响， 统治该地区。 观察确认预期的 在距离太阳几个太阳半径的范围内， 获取。 日全食提供了一些机会 观察和实验的时间， 仪器仪表 1978年，爱荷华州州立大学的一个研究小组开始开发一种 一个特殊的光电系统来检测和测量 灰尘 该仪器于1979年用于记录第一个 在两个点的尘埃速度分布的检测， 电晕。 两个实验室采用改进的仪器 在随后的日食系统没有成功。 如果天空 1991年日食的最佳条件，希望大约 10倍于以前收集的数据， 得到了 这些测量将提供关于 尘埃在F日冕中的运动。

The rare brief periods of total solar eclipse provide valuable opportunities for ground-based observers to study the inner regions of the solar corona. Dust particles in the outer regions of the corona (F corona) are believed to be orbiting under the combined influence of solar gravitational and radiative forces which dominate the region. Observational confirmation of the expected dust velocities within a few solar radii of the Sun are difficult to obtain. Total solar eclipses offer opportunities of a few minutes for observation and experimentation with suitable instrumentation. In 1978 a team at Iowa State University began development of a special electro-optical system to detect and measure the motion of the dust. The instrument was used in 1979 to record the first detections of the dust velocity profiles at two points in the corona. Two attemps to employ improved versions of the instrument system at subsequent eclipses were not successful. If the sky conditions are optimum for the 1991 eclipse, it is hoped that about 10 times the data that has been previously collected will be obtained. These measurements would provide information on the motions of the dust in the F corona.