The Recent Aurora

Physics

Scientific paper

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Scientific paper

ABOUT a quarter to seven this evening I became aware that an aurora was in the sky. A clear, persistent light showed itself near the northern horizon, whilst in the eastern sky fluctuating luminous regions formed an arc between 7h. and 7h. 15m. I noticed the position of that arc with respect to the constellations Aries and Pegasus. It began under α and β Arietis, at about, say, 5° north of the equator, and stretched parallel to a line through γ and α Pegasi, also at about 5° north of the equator. At times the arc extended further towards the south-western horizon. At about 7h. 30m. a remnant of the arc shot a ray diagonally to the square formed by the four stars of Pegasus, i.e. from γ to β Pegasi. The colour of the aurora was pale white in the northern light; in the arc it was white, approaching slightly to a green approximate to that of the magnesium light.

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