Fig. 1

a Zonal mean zonal winds (blue line) at 60°S and zonal mean temperatures (red line) at 80°S derived from ECMWF dataset during 2010 SH winter. The temperature scale is given on the right side. Vertical dashed lines indicate the day of peak warming. Dashed horizontal line indicates the zero wind level. b Same as a but using SD-WACCM simulations and are zonal mean values at 45 km. c Daily mean variability of F 10.7 cm solar flux. d Daily mean variability of Ap index