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Title: Thermal and dynamical perturbations in the winter polar mesosphere-lower thermosphere region associated with sudden stratospheric warmings under conditions of low solar activity
Authors: Lukianova, R.
Kozlovsky, A.
Shalimov, S.
Ulich, T.
Lester, Mark
First Published: 27-Jun-2015
Publisher: Wiley-Blackwell, American Geophysical Union
Citation: Journal of Geophysical Research: Space Physics (2015) 120(6) 5226–5240
Abstract: The upper mesospheric neutral winds and temperatures have been derived from continuous meteor radar (MR) measurements over Sodankyla, Finland, in 2008-2014. Under conditions of low solar activity pronounced sudden mesospheric coolings linked to the major stratospheric warming (SSW) in 2009 and a medium SSW in 2010 are observed while there is no observed thermal signature of the major SSW in 2013 occurred during the solar maximum. Mesosphere-ionosphere anomalies observed simultaneously by the MR, the Aura satellite, and the rapid-run ionosonde during a period of major SSW include the following features. The mesospheric temperature minimum occurs 1day ahead of the stratospheric maximum, and the mesospheric cooling is almost of the same value as the stratospheric warming (~50K), the former decay faster than the latter. In the course of SSW, a strong mesospheric wind shear of ~70m/s/km occurs. The wind turns clockwise (anticlockwise) from north-eastward (south-eastward) to south-westward (north-westward) above (below) 90km. As the mesospheric temperature reaches its minimum, the gravity waves (GW) in the ionosphere with periods of 10-60min decay abruptly while the GWs with longer periods are not affected. The effect is explained by selective filtering and/or increased turbulence near the mesopause.
DOI Link: 10.1002/2015JA021269
ISSN: 2169-9380
eISSN: 2169-9402
Version: Post-print
Status: Peer-reviewed
Type: Journal Article
Rights: Archived with reference to publisher website. ©2015. American Geophysical Union. All Rights Reserved. Version of record:
Appears in Collections:Published Articles, Dept. of Physics and Astronomy

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