Abstract
Spectrophotometer studies of the Na layer in twilight, made at Uppsala during 1960–70, have shown that the mean peak height of the layer varies between ≃ 86 and ≃ 92 km during one 11 yr sunspot period. The lowest values are recorded during sunspot maximum. This height variation is interpreted as a periodic change of the atmospheric density profile. It is concluded that the highest density at the level of Na layer appears during sunspot minimum.
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© 1973 D. Reidel Publishing Company, Dordrecht, Holland
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Derblom, H. (1973). Sunspot Cycle Variation in Atmospheric Density at the Level of the Sodium Layer. In: McCormac, B.M. (eds) Physics and Chemistry of Upper Atmosphere. Astrophysics and Space Science Library, vol 35. Springer, Dordrecht. https://doi.org/10.1007/978-94-010-2542-3_29
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DOI: https://doi.org/10.1007/978-94-010-2542-3_29
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