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Upper stratosphere-mesosphere-lower thermosphere perturbations during the intense Arctic polar night jet in 2019-2020
  • Renata Lukianova,
  • Alexander Kozlovsky,
  • Mark Lester
Renata Lukianova
Space Research Institute RAS

Corresponding Author:renata@aari.ru

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Alexander Kozlovsky
Sodankyla Geophysical Observatory
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Mark Lester
University of Leicester
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Thermal and dynamic perturbations at MLT heights during the strong stratospheric polar vortex as measured by the meteor radar at 67°N and the Aura satellite are presented. Mesospheric winds are dominated by vertical shears in the zonal component and the intense alternating north- and southward flows with a period of half a month. A temperature reduction at 90 km height is observed in the mid-winter and likely associated with a localized temperature increase in the upper stratosphere. Throughout January, a long-lived ~20K inversion layer persists just below the mesopause. These features are likely indicative of considerable stratification in the MLT as well as a decoupling of the middle and upper atmosphere.