Abstract
AMONG the effects of upper atmosphere [01] 6300 Å emission described by Barbier1 is a twilight enhancement which was afterwards observed in northern tropical latitudes at Hawaii by Barbier, Roach and Steiger2. Twilight enhancement consisting of at least two components has now been observed in southern tropical latitudes at Townsville (geomagnetic latitude 28.4° S.). Here an enhanced brightness in the south-south-west persists for a few minutes immediately after twilight has diminished sufficiently for photometer measurements to be taken. This is a summer-time effect which appears to be superimposed on a general twilight enhancement occurring at all azimuths during both winter and summer.
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References
Barbier, D., Ann. Geophys., 17, 3 (1961).
Barbier, D., Roach, F. E., and Steiger, W. R., J. Res. Nat. Bur. Stand., 66, D, 145 (1962).
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CARMAN, E., GIBSON-WILDE, B., KILFOYLE, B. et al. Tropical Twilight Behaviour of the [01] 6300 Å Air Glow at Townsville. Nature 198, 1077–1078 (1963). https://doi.org/10.1038/1981077b0
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DOI: https://doi.org/10.1038/1981077b0
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