Fig. 2
From: Simultaneous ground-based optical and SuperDARN observations of the shock aurora at MLT noon
ACE solar wind data and geomagnetic Sym-H index for the interval 06:00-12:00 UT on 7 January 2005. From top to bottom they are: IMF Bz in GSM coordinates, Bx and By components, Solar wind proton density (Nsw), Velocity of the solar wind X component, Solar wind dynamic pressure (Pdyn), Geomagnetic Sym-H index. Two vertical dashed lines indicate the shock time (08:40 UT) recorded by ACE and the arrival time (09:22 UT) of the shock to the magnetosphere