Solar Eclipse F Corona Velocity Measurements

罕见的短暂日全食为地面观测者研究日冕内部区域提供了宝贵的机会。在日冕（F日冕）外围区域的尘埃粒子被认为是在太阳引力和辐射力的共同影响下绕轨道运行的。在太阳的几个太阳半径范围内的预期尘埃速度的观测确认是很难获得的。日全食为用合适的仪器进行几分钟的观测和实验提供了机会。1978年，爱荷华州立大学的一个研究小组开始开发一种特殊的光电系统来探测和测量尘埃的运动。1979年，该仪器首次记录了日冕两个点的尘埃速度分布。两次尝试在随后的日食中使用改进版本的仪器系统都没有成功。如果1991年日食的天空条件是最佳的，预计将获得以前收集的数据的10倍左右。这些测量将提供有关F日冕中尘埃运动的信息。

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.