In panel (a), from up to down, are reported the Solar flux F10.7 from 09 to 16 July 1985, and the IMF magnitude and Z component evolution for the same period. In panel (b), from up to down, are described respectively the AE index, the a _p index and the Dst index, from 09 to 16 July 1985. (The hourly AE index data are retrieved through the Kyoto AE index service http://wdc.kugi.kyoto-u.ac.jp/dstae/index.html. Three-hour a _p data are provided by NOAA ftp://ftp.ngdc.noaa.gov/STP/GEOMAGNETIC_DATA/INDICES/KP_AP. Dst and Solar data are obtained from NASA Goddard Space Physics Data Facilities OMNIWEB: https://omniweb.gsfc.nasa.gov/form/dx1.html).