Koomen M J, Detwiler C R, Brueckner G E, Cooper H W, Tousey R
Appl Opt. 1975 Mar 1;14(3):743-51. doi: 10.1364/AO.14.000743.
A small, externally occulted Lyot-type coronagraph, designed for use in the seventh unmanned Orbiting Solar Observatory (OSO-7), is described. Optical configuration, suppression of stray light, SEC vidicon detector, and data system are discussed, as well as integration of the instrument into the spacecraft and operation in orbit. Orbital operation produced daily images of the white light corona, from 2.8 to 10 solar radii, at least once per day for 2(3/4) yr. The first records of white light coronal transient events were obtained, and the corona was shown to be constantly changing.
本文描述了一种小型的、外部遮挡式的里奥特型日冕仪，该日冕仪设计用于第七颗无人轨道太阳观测台（OSO - 7）。文中讨论了其光学配置、杂散光抑制、SEC视像管探测器和数据系统，以及该仪器在航天器中的集成和在轨运行情况。在轨运行期间，在2.8至10个太阳半径范围内，每天至少获取一次白光日冕的图像，持续了2（3/4）年。获得了白光日冕瞬变事件的首批记录，并且日冕显示出不断变化的特征。
