Abstract
EARLIER observations of lithium resonance lines in twilight1 have been effectively reviewed by Gadsden and Salmon2. They conclude that the very large intensities observed in August and September 1958 were probably due to lithium from a high-altitude thermonuclear explosion, but that occasional observations of the natural emission at its brightest had been made. We wish to report a series of photoelectric observations of faint natural emission, as well as a large enhancement reasonably attributed to the large thermonuclear explosions at the end of October 1961.
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References
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SULLIVAN, H., HUNTEN, D. Lithium Twilight at Saskatoon, 1960–61. Nature 193, 1064–1065 (1962). https://doi.org/10.1038/1931064a0
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DOI: https://doi.org/10.1038/1931064a0
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