Abstract
RECENT SUNSPOT AND MAGNETIC DISTURBANCE.—Several observers noted a spot on the sun's disc seen with the naked eye through the morning mist on Jan. 8. The spot was not an unusually large one, but it is of interest on account of the frequent changes which took place within the stream (of which the leader was the naked-eye object), and also its probable connexion with a magnetic disturbance recorded at Greenwich on Jan. 7 and 8. The most noticeable feature shown by the chief spot was a very bright tongue or ‘bridge’ which crossed the umbra from south to north on Jan. 3–8. On Jan. 7 this ‘bridge’ appeared to separate the whole spot nearly completely into two portions. The magnetic disturbance, of moderate intensity, commenced about noon on Jan. 7 and died out at 3 hr. on the following day. The greatest deviation of the declination magnet from its normal position was about 00.5. The table of important spots for 1927 is continued as follows No. Date on Disc. Central Meridian Latitude. Area. Passage.
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Our Astronomical Column. Nature 119, 98 (1927). https://doi.org/10.1038/119098a0
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DOI: https://doi.org/10.1038/119098a0