Abstract
IN connection with the aurora borealis observed by Major Loekyer on September 28–29 (NATURE, October 6), there was a magnetic disturbance of considerable activity recorded at this observatory. It commenced at 12h., September 28. There were minor movements on the H magnet, D remaining quiet, until a more active phase of the disturbance commenced about 19h., September 28. The major movements on all three magnets, D, H, and V, took place between 1h. 36m. and 4h. 50m., September 29. The extreme ranges on the curves were D 30′, H 82γ, and V 85γ (γ=10–5 C.G.S. units). The mean daily ranges, for comparison, for the quiet days of September were D 7′, H 36γ, and V 11γ.
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