The association of polar mesosphere summer echo layers with tidal modes

Williams, P. J. S.; Jones, G. O. L.; Palmer, J. R.; Rishbeth, H.. 1995 The association of polar mesosphere summer echo layers with tidal modes. Annales Geophysicae, 13 (4). 454-457.

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The occurrence of PMSEs with time of day shows a semi-diurnal variation with minima at 8 and 20 h LT. PMSE layers observed for more than 30 min show an average rate of descent of 2 km h−1. These characteristics suggest the influence of tidal winds. When the observed steady wind and diurnal and semi-diurnal tides at EISCAT are added, the overall magnitude shows a time-variation which matches the occurrence of PMSEs, and the observed rate of descent, approximately 2 km h−1. Atmospheric gravity waves also contribute to the velocity of the neutral wind. When the wave reinforces the background wind, the PMSEs are stronger and descend more rapidly, but when the wave-related velocity opposes the background wind the PMSE is weaker and it descends more slowly.

Item Type: Publication - Article
Digital Object Identifier (DOI):
Programmes: BAS Programmes > Pre 2000 programme
ISSN: 1432-0576
Date made live: 17 Jan 2017 11:21 +0 (UTC)

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