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An Effect of Sunlight on the Altitude of Aurora Rays

Abstract

ON Sept. 8, 1926, between 21h 30m and 22h, Greenwich mean time, I saw from Bygdö, near Oslo, a remarkable aurora in the west. It had the form of a portion of a feeble arc of grey violet colour, stretching upwards from the horizon about 40°. Later on this arc changed into a diffuse mass sharply limited on its south border.

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STROMER, C. An Effect of Sunlight on the Altitude of Aurora Rays. Nature 120, 329–330 (1927). https://doi.org/10.1038/120329a0

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