Abstract
IN a previous communication1, it was pointed out that strong absorption by atmospheric constituents obscures large parts of the infra-red spectrum from ground-level observation. However, by working at high altitudes and by using a high-resolution spectrometer, it is possible to observe additional features due to absorption in the solar atmosphere. Among these are two absorption lines due to the electronic transitions in solar hydrogen 3โ4 and 4โ8, which occur in the great water-vapour band at 1.9ยต.
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References
Houghton, J. T., Moss, T. S., Seeley, J. S., and Hawkins, T. D. F., Nature, 180, 1187 (1957).
Houghton, J. T., and Seeley, J. S., Quart. J. Roy. Met. Soc., 86, 358 (1960).
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HUGHES, N., MOSS, T. Some Solar Lines in the Infra-Red Spectrum observed from a High-Flying Aircraft. Nature 189, 908โ909 (1961). https://doi.org/10.1038/189908a0
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DOI: https://doi.org/10.1038/189908a0
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