Fig. 2From: Geomagnetically conjugate observations of ionospheric and thermospheric variations accompanied by a midnight brightness wave at low latitudesAll-sky images obtained by airglow imagers at a–d Kototabang and e–h Chiang Mai from 1602 to 1732 UT on February 7, 2011. Up is geographic north and left is geographic east in each imageBack to article page