Abstract
With the diffusive separation of the upper atmosphere horizontal motions lead to horizontal differentiation in composition. Thermally driven winds effectively transport the lighter and minor species from the warmer toward the cooler regions on the globe. Due to the abundance of atomic oxygen a back pressure develops which significantly dampens the wind velocities and increases the temperature contrast. During summer and under magnetically disturbed conditions, the observed large temperature enhancements and depletions in 0 and He are prominent manifestations of these processes at polar latitudes. As a feedback mechanism, advective mass transport completely changes the “primary” composition effects induced by eddy diffusion. Owing to the rotational nature of EXB momentum coupling its signature in composition is comparatively weak, and clearly distinguishable from the effects of Joule dissipation.
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Mayr, H.G., Harris, I. (1980). Wind Induced Composition Effects at High Latitudes. In: Deehr, C.S., Holtet, J.A. (eds) Exploration of the Polar Upper Atmosphere. NATO Advanced Study Institutes Series, vol 64. Springer, Dordrecht. https://doi.org/10.1007/978-94-009-8417-2_3
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DOI: https://doi.org/10.1007/978-94-009-8417-2_3
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