22 March


Solar wind speeds, measured by the ACE spacecraft, began the period at
nominal levels. A solar sector boundary change from negative (towards)
to positive (away) was coincident with a rise in temperature and wind
speed beginning just before 0100 UTC. Solar wind speeds gradually
increased from approximately 350 km/s at that time to end of period
speeds around 450 km/s. This is indicative of the early effects of a
geoeffective coronal hole high speed stream (CH HSS). IMF total field
ranged from 2 nT to 10 nT while Bz remained mostly positive but varied
between -5 nt and +9 nT.

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