Fig. 4

Stratospheric temperature deviation (black curve) during December 2007-January 2008 from its 30-year mean at 60–90º N (top) and the corresponding stratospheric zonal wind difference (bottom). The morning/afternoon averaged vertical E × B drift differences over Jicamarca are over-plotted in red/blue (open diamond/asterisk symbols) (see scale in the right y-axis). Note that the signs have been reversed for the zonal wind plot (Chau et al. 2009)