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Measurements from 2002 to 2011 by three independent satellite instruments,namely MIPAS, SABER, and SMR on board the ENVISAT, TIMED, and Odin satellitesare used to investigate the intra-seasonal variability of stratospheric andmesospheric O3 volume mixing ratio (vmr) inside the Antarctic polarvortex due to solar and geomagnetic activity. In this study, we individuallyanalysed the relative O3 vmr variations between maximum and minimumconditions of a number of solar and geomagnetic indices (F10.7 cm solar radioflux, Ap index, ≥ 2 MeV electron flux). The indices are 26-day averagescentred at 1 April, 1 May, and 1 June while O3 is based on 26-dayrunning means from 1 April to 1 November at altitudes from 20 to 70 km.During solar quiet time from 2005 to 2010, the composite of all threeinstruments reveals an apparent negative O3 signal associated to thegeomagnetic activity (Ap index) around 1 April, on average reachingamplitudes between −5 and −10% of the respective O3 background.The O3 response exceeds the significance level of 95% andpropagates downwards throughout the polar winter from the stratopause down to~ 25 km. These observed results are in good qualitative agreement withthe O3 vmr pattern simulated with a three-dimensionalchemistry-transport model, which includes particle impact ionisation

Energetic particle induced intra-seasonal variability of ozone inside the Antarctic polar vortex observed in satellite data