Fig. 10From: Physical mechanism for the temporary intensification of wintertime sporadic E layers in 2009Altitude–latitude cross-section of zonal-mean zonal winds (ZMZWs) between 2009 and 2011 from the surface to the ionospheric E region. The ZMZWs were averaged during the simulation period (24–54 DOY). The red and blue colors indicate the eastward and westward winds, respectively.Back to article page