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Distribution in time is governed by the spot-cycle, but the maximum lasts longer for prominences than for spots. The structure of the chromosphere was investigated in 1869 and subsequent years by Professor Respighi, director of the Capitoline Observatory, as well as by Spörer, and Brédikhine of the Moscow Observatory.
Agnes M. (Agnes Mary) Clerke - A Popular History of Astronomy During the Nineteenth Century
Fourth Edition
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