Word: spectrographically
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Dates: during 1950-1959
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...four years Astronomer Aden B. Meinel of the University of Chicago's Yerkes Observatory had worked on the problem. He devised a powerful spectrograph, built around a special Schmidt camera, which gathers light from a large area of the sky. Last month, when the sun was nicely spotted in the right places, he got his apparatus ready and pointed it in the direction from which he expected the hydrogen particles to come. Nicely on schedule, the night sky lit up with an "extreme aurora...