Word: coronae
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...specific function of the coronagraph is to determine the wavelength distribution of the corona's ultraviolet rays in order to derive temperatures within the corona...
...group of Harvard scientists--working under a $280,000 grant from the National Aeronautics and Space Administration--has constructed a new device to gather data on the solar corona...
...coronograph is designed to create an artificial solar eclipse, thereby permitting observation of the ultraviolet rays of the corona, the portion of the sun's atmosphere which extends well beyond the visible disk...
Because the corona is only one-billionth as bright as the sun's visible disc, scientists have been able to observe only a very limited portion of the corona when the sun is not eclipsed. An extensive observation of the corona has occurred just once, during the 1970 total solar eclipse, by an expedition force led by Donald H. Menzel, former director of the Harvard Observatory...
Menzel was an authority on the sun and the sun's corona, Cornell said. He wrote 26 books in his lifetime, and his last, concerning unidentified flying objects, was published posthumously, Cornell added...