FAST WARNING 'PRESTO' MESSAGE  from the SIDC (RWC-Belgium) 2020 Oct 19
18:24:23

The in situ observations show the arrival of the shock wave, Oct 19th at
13:45UT. The magnetic field magnitude, increased from 5 to 10 nT, with a
simultaneous increase at the solar wind speed (maximum value reached was
440 km/s), density and the temperature. The solar origin of the observed
shock is presently unclear. Currently the Bz component of the
interplanetary magnetic field returned to being negative and no geomagnetic
disturbance is expected (K Dourbes reached 3 and currently K=2 Kp=3, as
last reported by Dourbes and NOAA, respectively).