Fig. 8From: Penetration electric fields observed at middle and low latitudes during the 22 June 2015 geomagnetic storma The auroral electrojet indices (AU and AL) and b magnetic H-components at Dixon (DIK, 02 MLT at 20 UT) and Pebek (PBK, 07 MLT). c The Hp (northward) component of the magnetic field measured onboard the geosynchronous orbit satellite, ETS-VIII. The westward AEJ increases at 2005 UT after the magnetic dipolarization in the magnetotail at 2001 UTBack to article page