Abstract
Recent Magnetic Disturbances.—A magnetic disturbance with a range in declination of 30′ was registered at Greenwich between April 6 and 9. There was no definite commencement, which may be taken as occurring about 18th on April 6. The greatest range in declination was registered on April 7–8,. This is the third member of a sequence of three small storms which have taken place at intervals of about a solar synodic rotation. The dates of the two preceding storms are Mar. 11—18 (commencement Mar. 11—6) and Feb. 12—16 (commencement Feb. 12—9). No unusual solar disturbance was observed on any of the above dates, but cloudy weather in England rendered observing impossible on most days just before and during each magnetic storm. It may be noted, however, that a fair-sized sunspot in latitude 17° N. crossed the sun's central meridian on April 7—1.
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Our Astronomical Column. Nature 125, 613 (1930). https://doi.org/10.1038/125613a0
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DOI: https://doi.org/10.1038/125613a0