Abstract
IN NATURE of February 22, p. 311, a short account was given of an active group of sunspots which had been under observation at the Royal Observatory, Greenwich, with the Hale spectrohelioscope. The date of the central meridian passage of the centre of the group of spots was February 14.0, and some hours later a bright eruption, of major importance, visible in the hydrogen line, H, was observed from its first rapid development at 12h 39m to its termination about 13h 27m U.T.
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NEWTON, H. An Active Group of Sunspots and Unusual Conditions in the Ionosphere. Nature 137, 363 (1936). https://doi.org/10.1038/137363a0
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DOI: https://doi.org/10.1038/137363a0
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