20th October

Solar wind parameters indicated the likely onset of a positive polarity
coronal hole high speed stream (CH HSS) at around 20/1800 UTC. Solar
wind speeds were steady between 375-475 km/s through 20/0800 UTC when
wind speeds increased to near 550 km/s. IMF total field values were
steady between 5-11 nT and Bz varied between +8 nT and -8 nT. The phi
angle was steady in a positive (away) solar sector throughout the
period.

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