Fig. 2

Solar wind and geomagnetic parameters for the four of our selected CME events having the smoothest southward IMF Bz during the period of ASI viewing. The same parameters are also shown for four HHS storms with fluctuating IMF during their period of ASI viewing. For each storm, vertical dashed lines give all the substorm onsets identified with the ASI array. Magenta dashed line identify the 7 substorm identified during steady, strong southward IMF of the CME storms. Pdym is solar wind dynamic pressure. The SuperMAG ring and auroral U and L indices are the same as the standard ring current Sym-H and auroral AU and AL indices, except from a large array of available magnetometer stations