Abstract
I HAVE been trying for the past ten years to interest the astronomers in having photographs of stellar spectra made during the long arctic or antarctic night, on the chance that the ultra-violet cut off due to ozone may be less powerful, and I mentioned it to Prof. Russell last spring. I have always emphasised the importance of choosing a station so situated that there will be a minimum chance that ozone formed in the illuminated regions will be carried over into the dark region by atmospheric circulation. Information regarding the direction and velocity of the upper atmospheric current will be necessary in choosing the site. It should certainly be nearer the pole than the station occupied by Prof. Bosseland (NATURE, Feb. 9, p. 207), for the sun at noon was only three or four degrees below the horizon, and the air five miles above the surface was in full sunlight, as Prof. Russell pointed out to me. His negative result I do not regard as decisive, though I am not very hopeful that much or any extension of the spectrum will be found, as ozone is fairly stable. An objective prism pointed at the pole star seems the simplest device.
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WOOD, R. Ozone Absorption during Long Arctic Night. Nature 123, 644 (1929). https://doi.org/10.1038/123644c0
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DOI: https://doi.org/10.1038/123644c0
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