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Abstract
MAY I add a few remarks on Mr. Evershed's interesting letter on this topic (NATURE, December 29, p. 566), and supplementary also to my former letter (NATURE, October 27, p. 272). The protracted magnetic storm of May 12–21, 1921, after a lull on May 18, resumed an active phase on May 19–21. In my former letter I traced a sequence of magnetic disturbances, in connection with that of May 21, which extended to October 5. I may now add that the sequence has persisted until December 24, that is for 217 days, embracing eight synodical rotations of the sun, with a mean period of 27.13 days. The corresponding mean sidereal period would be 25.25 days, or 14.26° per day. This is Carrington's rotation period for latitudes 10° to 15°, and agrees closely with the sidereal period found by Mr. Evershed for the main series of disturbances from March 22 to September 29, 1921.
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