Abstract
A VERY notable magnetic disturbance—the greatest recorded at Stonyhurst for more than four years—occurred on April 30-May 2, the greatest movements being between noon and midnight on May 1. The ‘storm’, as it may fairly be called, began with a typical ‘sudden commencement’ at 16h. 27m. G.M.T. on April 30, when decimation suddenly fell 2′ and then rose 6′, whilst horizontal force fell 36γ followed by a rapid rise of 75γ. No important movements followed until about 21h., when a ‘bay’ formed in both D and H, lasting about four hours, after which conditions were quiet until about 13h. on May 1, when the greatest movements began to manifest themselves, and the disturbance ended almost as abruptly as it began at about Ih. on May 2. The range in D was 60′ and in HF 436γ, ranges which have not been exceeded since 1929 Feb. 27–28.
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References
cf. Greaves and Newton, Man. Not. Roy. Ast. Soc., 88, 556, and 89, 84.
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ROWLAND, J., J., S. Recent Magnetic Disturbances. Nature 131, 764–765 (1933). https://doi.org/10.1038/131764c0
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DOI: https://doi.org/10.1038/131764c0
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