Fig. 6From: Latitudinal and interhemispheric differences of the ionospheric semi-diurnal lunitidal perturbations during the 2009 Arctic sudden stratospheric warming event in the eastern Asia–Australia sectorThe variations of AM2 and ERM2 in the eastern Asia–Australia and American sectors during the 2009 SSW. The vertical dashed lines are the same as those in Fig. 2a. The horizontal dashed lines represent the geomagnetic equatorBack to article page