Abstract
THE SOLAR ACTIVITY.—The “maximum” character of the present solar-activity epoch is being well maintained by the frequent appearance of large groups of spots. Observations made on July 6 showed two medium sized spots coming round the eastern limb, and as this group travelled across the visible disc it developed considerably. On July 13 it formed a large and somewhat scattered group of which the roughly estimated extent was about 100,000 miles, and which could be readily seen by the properly protected naked eye. On July 10 this group was followed by a much more striking, although somewhat less extensive, group, consisting of two exceedingly well defined and large nuclei surrounded by well marked penumbrse and smaller spots. On July 14 both groups were readily observable with the naked eye, this being the second occasion during the present year on which two naked-eye groups have been on the solar disc simultaneously.
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Our Astronomical Column . Nature 72, 279 (1905). https://doi.org/10.1038/072279a0
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DOI: https://doi.org/10.1038/072279a0