Abstract
1. IN a previous communication by us to this Society, an abstract of which was published in the Proceedings, vol. xiv. p. 59,† we showed some grounds for believing that the behaviour of sun-spots with regard to increase and diminution, as they pass across the sun's visible disc, is not altogether of an arbitrary nature. From the information which we then had, we were led to think that during a period of several months sun-spots will, on the whole, attain their minimum of size at the centre of the disc. They will then alter their behaviour so as, on the whole, to diminish during the whole time of their passage across the disc; thirdly, their behaviour will be such that they reach a maximum at the centre; and, lastly, they will be found to increase in size during their whole passage across the disc. These various types of behaviour appear to us always to follow one another in the above order; and in a paper printed for private circulation in 1866, we discussed the matter at considerable length, after having carefully measured the area of each of the groups observed by Carrington, in order to increase the accuracy of our results. In this paper we obtained nineteen or twenty months as the approximate value of the period of recurrence of the same behaviour.
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Further Investigations on planetary Influence upon Solar Activity * . Nature 5, 423–426 (1872). https://doi.org/10.1038/005423a0
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DOI: https://doi.org/10.1038/005423a0