Word: coronas
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Dates: during 1950-1959
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...eclipse. Not until 1930, when French Astronomer Bernard Lyot built the first coronagraph, did anyone succeed in imitating the natural event. Astronomer Lyot put a small brass disk between the lenses of a simple telescope, cutting off direct sunlight and permitting him to focus the dim radiance of the corona and solar prominences upon a sheet of photographic film. It was a simple enough trick, but one that could not be carried off without superfine lenses, free of any imperfections and kept scrupulously clean. Even the scattered light from a few grains of dust would have ruined the pictures...
Cameras will record the movements of the ghostly corona. And by watching the waving filaments weave their patterns in space, astronomers hope to learn how to forecast the sun-caused atmospheric disturbances that can cripple the world's communication systems and block the best radar instruments...
Prediction of solar disturbances, including sunspots, is largely a project of the University's High Altitude Observatory in Colorado. According to Dunn, when a green line is visible in the sun's corona, sunspots can be expected in the next few days. The line is associated with the same incandescent gases which cause the sunspots...
...Corona, Calif...
...added that this same material, by scattering the light from the sun at the time of a total solar eclipse, contributes to the brightness of the corona--the ring or light remaining when the sun is completely blocked by the moon...