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Middle Atmosphere Studies with the Eiscat Radars:Polar Mesosphere Summer Echoes

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Coupling Processes in the Lower and Middle Atmosphere

Part of the book series: NATO ASI Series ((ASIC,volume 387))

Abstract

The EISCAT radars are used for ground-based remote sensing of the middle and upper atmosphere in polar regions. As an outstanding example of coupling between the neutral and ionized mesosphere we describe here the Polar Mesosphere Summer Echoes: PMSE. The experimental technique is briefly outlined and characteristics of PMSE, observed with EISCAT, are described. These cannot generally be attributed to turbulence scatter or incoherent scatter. We report about dynamical features seen in PMSE, such as gravity waves, which can be steepened, and turbulence. Also features of solitary waves are seen in the PMSE. The PMSE are often occurring in thin strata or laminae, which can be attributed to localized cooling due to long period waves. Here the electron density can be depleted, which is also observed with the radar. We discuss the possibility of enhanced fluctuations in the electron gas at smaller scales than the neutral turbulence fluctuations, which cause PMSE. This can occur in the presence of large and heavy cluster ions, which form in the cold polar mesosphere. Also effects of non-thermal electron density fluctuations due to the presence of charged dust or cluster ions is briefly discussed as possible cause of PMSE, and an outlook is given on future directions of this research work.

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© 1993 Springer Science+Business Media Dordrecht

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Röttger, J. (1993). Middle Atmosphere Studies with the Eiscat Radars:Polar Mesosphere Summer Echoes. In: Thrane, E.V., Blix, T.A., Fritts, D.C. (eds) Coupling Processes in the Lower and Middle Atmosphere. NATO ASI Series, vol 387. Springer, Dordrecht. https://doi.org/10.1007/978-94-011-1594-0_25

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  • DOI: https://doi.org/10.1007/978-94-011-1594-0_25

  • Publisher Name: Springer, Dordrecht

  • Print ISBN: 978-94-010-4694-7

  • Online ISBN: 978-94-011-1594-0

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