The Magnetic Disturbance of July 21, 1927


IN the Astronomical Column of NATURE of July 30 the suggestion is thrown out that the magnetic disturbance recorded on July 21–22 may, in the absence of any striking spot display, be attributed to an unusually active region on the sun not represented by a spot, etc.

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BUSS, A. The Magnetic Disturbance of July 21, 1927. Nature 120, 227 (1927).

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