Stratospheric polar vortex

Predictability of the Mesosphere and Lower Thermosphere during Major Sudden Stratospheric Warmings

SW2 amplitude in meridional wind
Friday, June 18, 2021

Stratosphere sudden warmings (SSWs) are strong disturbances in the high latitude, wintertime, stratospheric polar vortex.

Sudden Stratospheric Warmings

Graphic image of ionospheric behavior during the 2009 SSW event
Friday, October 23, 2020

Sudden stratospheric warmings (SSWs) are impressive fluid dynamical events in which large and rapid temperature increases in the winter polar stratosphere (∼10–50km) are associated with a complete reversal of the climatological wintertime westerly winds.

Thermospheric composition O/N2 response to an altered meridional mean circulation during Sudden Stratospheric Warmings observed by GOLD

Graphic image of GOLD O/N2 ratios
Wednesday, February 12, 2020

GOLD measurements provide the first observational proof of model predictions that the break up of the stratospheric polar vortex changes the composition of the thermosphere.

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