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Thermal and dynamical perturbations in the winter polar mesosphere-lower thermosphere region associated with sudden stratospheric warmings under conditions of low solar activity

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posted on 2015-07-22, 11:13 authored by R. Lukianova, A. Kozlovsky, S. Shalimov, T. Ulich, Mark Lester
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.

Funding

R.L. and S.S. acknowledge support from the Academy of Finland grant 276824 and Russian MoES grant 14.607.21.0058. M. L. acknowledges support from NERC via NERC grant NE/K011766/1.

History

Citation

Journal of Geophysical Research: Space Physics (2015) 120(6) 5226–5240

Author affiliation

/Organisation/COLLEGE OF SCIENCE AND ENGINEERING/Department of Physics and Astronomy

Version

  • AM (Accepted Manuscript)

Published in

Journal of Geophysical Research: Space Physics (2015) 120(6) 5226–5240

Publisher

Wiley-Blackwell, American Geophysical Union

issn

2169-9380

eissn

2169-9402

Acceptance date

2015-05-31

Copyright date

2015

Available date

2015-12-27

Publisher version

http://onlinelibrary.wiley.com/doi/10.1002/2015JA021269/abstract

Language

en

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