Fig. 7
From: The AUTUMNX magnetometer meridian chain in Québec, Canada
Inversion results for a simple electrojet model from 5 to 13 UT on February 17 2015. The bottom panel indicates the electric current across the AUTUMNX East Hudson Bay meridian chain, the middle the lower (blue) and upper (red) electrojet borders. The upper panel shows the three components of OMNI propagated interplanetary magnetic field. For a brief period near 12 UT, the upper and lower borders may reverse, which has no physical meaning