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The Blue Sun of 1950 September

The Blue Sun of 1950 September Abstract This paper deals with the “blue” Sun observed at Edinburgh on 1950 September 26. Spectrophotometric observations of the “ blue ” and normal Suns give an extinction curve of the layer causing the phenomenon. This covers the wave-length range 3800–6300 A. and shows blueing on the long wave-length side, and reddening on the short wave-length side, of a minimum situated at λ 4350. This affords an experimental verification of an outstanding feature of scattering theory. It is concluded that the scattering particles producing the minimum are dielectric, and uniform in size and constitution. A relation between the size and refractive index of the dielectric particles is deduced. In addition to the selective effect, there is a heavy non-selective extinction which may arise from another system of absorbing particles in the layer. Other workers have established the source of the layer as the extensive forest fires burning in Alberta on 1950 September 23. This content is only available as a PDF. © 1951 Royal Astronomical Society. Provided by the NASA Astrophysics Data System http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Monthly Notices of the Royal Astronomical Society Oxford University Press

The Blue Sun of 1950 September

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Publisher
Oxford University Press
Copyright
© 1951 Royal Astronomical Society. Provided by the NASA Astrophysics Data System
ISSN
0035-8711
eISSN
1365-2966
DOI
10.1093/mnras/111.5.478
Publisher site
See Article on Publisher Site

Abstract

Abstract This paper deals with the “blue” Sun observed at Edinburgh on 1950 September 26. Spectrophotometric observations of the “ blue ” and normal Suns give an extinction curve of the layer causing the phenomenon. This covers the wave-length range 3800–6300 A. and shows blueing on the long wave-length side, and reddening on the short wave-length side, of a minimum situated at λ 4350. This affords an experimental verification of an outstanding feature of scattering theory. It is concluded that the scattering particles producing the minimum are dielectric, and uniform in size and constitution. A relation between the size and refractive index of the dielectric particles is deduced. In addition to the selective effect, there is a heavy non-selective extinction which may arise from another system of absorbing particles in the layer. Other workers have established the source of the layer as the extensive forest fires burning in Alberta on 1950 September 23. This content is only available as a PDF. © 1951 Royal Astronomical Society. Provided by the NASA Astrophysics Data System

Journal

Monthly Notices of the Royal Astronomical Society – Oxford University Press

Published: Oct 1, 1951

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