Physics of auroral phenomena : proceedings of the 33rd Annual seminar, Apatity, 02 - 05 March, 2010 / [ed.: A.G. Yahnin, A. A. Mochalov]. - Апатиты : Издательство Кольского научного центра РАН, 2011. - 206 с. : ил.

Yu. V. Platov, S.A. Chemouss Fig. 3. Scheme of the spiral structure after the separation o f the second stage. Turquoise glow. Blue-green (turquoise) forms in the mesosphere frequently observed during solid-fuel rocket launches in the twilight conditions. Typically, these formations are sufficiently compact form "clouds", localized at the separation of rocket stages, and sometimes represent a characteristic diffuse winds "striated" trail - see Fig. 4a. Spectral observations conducted by auroral research programmes showed that the emissions o f these formations are dominated by emissions of Al, A10, Li (Fig. 4b). Fig. 4. a) “Turquoise" smeared winds trail left by the passage of solid-fuel rocket, b) spectrum of gas-dust cloud formed by the combustion products of solid-propellant ballistic missile engine. Metallic aluminum, lithium compounds and other components can be used in solid rocket fuels as admixtures to improve combustion stability [4, 5], and aluminum oxide can be formed by the oxidation of aluminum by atmospheric oxygen. It is also possible a different mechanism of formation of AlO. One of the main components of the combustion products of solid propellant missiles is aluminum oxide A120 3 (~ 40% by weight [6]), which represents the fine fraction. At high temperatures (1300 K) as a result of accession to the molecules of aluminum oxide may be the formation of aluminum oxide AlO, located in a gaseous state. Blue-green fluorescence was also 188