From: On some features characterizing the plasmasphere–magnetosphere–ionosphere system during the geomagnetic storm of 27 May 2017
SW pressure (nPa)
Sym-H (nT)
By,IMF (nT)
Bz,IMF (nT)
Before the IS
0.5
8.1
− 0.02
− 1.8
After the IS
8.5
20.5
1.40
− 5.2