Abstract
Magnetic Disturbance, Dec. 3–4, 1930.—A considerable magnetic disturbance, falling into the category of a small storm, occurred on Dec. 3–4. The storm began with a characteristic ‘sudden commencement’ on Dec. 3 at 11/4h, but apart from this the oscillations of the needles were not appreciable until about thirteen hours later, the most disturbed part of the traces being between 15h and 22h on Dec. 3. The range in Declination at Greenwich was 51′. At the time of the storm there was only a smallish sunspot, of area 130 millionths of the sun's hemisphere, a little way past the central meridian. Spectroscopic observations, which greatly increase the range of detection and scrutiny of solar eruptions, were impossible owing to fog or overcast skies. The recent magnetic storm appears to be the largest since that of Mar. 11–13, 1929, though during 1930 a number of disturbances of somewhat lesser intensity have occurred.
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Our Astronomical Column. Nature 126, 932 (1930). https://doi.org/10.1038/126932a0
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DOI: https://doi.org/10.1038/126932a0